What will applying a rubbing compound do to your gelcoat? Two additives will help with a desired final finish. If you have any other questions, please don’t hesitate to comment, message or call! Choose another answer! This article has been viewed 338,884 times. Determine the Existing Surface: First thing you want to do is look at the surface on which you want gelcoat applied. Read on for another quiz question. If your gelcoat doesn't come with any MEKP when you buy it, you'll have to buy it separately. Apply gel coat in 4-5 layers at approximately 5 mils each, allowing 15-20 minutes between layers for a total thickness of 20-25 mils. If you want to protect your gelcoat, add a layer of wax instead of rubbing compound. We know ads can be annoying, but they’re what allow us to make all of wikiHow available for free. Before you apply gelcoat, sand down cracks. If you look at a pool, or even a boat, the gelcoat is the color you see. If you need more working time, be sure to sit the can in some cool water, or even some ice to cool it down to 60 degrees give you a bit more time. We recommend 18 mils thick, to properly cure. What paints are compatible with TotalProtect? Rolling Gelcoat On Boat Deck . Fiberglass hel… You can also use a paint scraper, but it doesn't work well on irregular surfaces. It will take a minimum of two coats of gelcoat if you are changing colors. Can gel coat be applied over epoxy resin??? Spraying Gelcoat Over Old Gelcoats . Measure the suggested amount of color tint from the color chart so that the gel will match the color of the rest of the inside of the boat hull. Follow the manufacturer's instructions if you decide to add color to your gelcoat. Try again! Is there a thinner for gelcoat for fiberglass? What do I do if my gel coat is chalky and has no shine after each coat? Be sure not to use foam rollers, as they tend to leave bubbles. Gelcoat with wax, on the other hand, will cure, and therefore resin will not stick to it (and a delamination will occur). If you want your gelcoat to be colored, you'll have to add color separately. The glass fiber fabric is then laid on top of this and shaped to meet the requirements. Our customers’ fiberglass repairs range from filling a minor screw hole to completely rebuilding the bottom of a boat that ran aground. Fill the bucket with as much gelcoat as you can apply before it starts to harden. We recommend 1-1/4% to 1-1/2% by volume, which means 13-15cc’s per quart. It's a good idea to clean your fiberglass before you apply gelcoat, but if there are cracks, there is something else you need to do first. https://www.youtube.com/watch?v=cH5vMiNBCsU&feature=youtu.be&t=125, https://www.powerandmotoryacht.com/maintenance/how-to-maintain-the-gelcoat-on-your-boat, https://www.boatingmag.com/how-to-repair-damaged-gelcoat#page-11, https://www.boatingmag.com/how-to-repair-damaged-gelcoat#page-9, https://www.youtube.com/watch?v=_itHDix3hPE&feature=youtu.be&t=12, https://www.youtube.com/watch?v=kSPIrow89Bc&feature=youtu.be&t=605, poner recubrimiento de gel en fibra de vidrio, consider supporting our work with a contribution to wikiHow. For applying your gelcoat, you can either roll the gelcoat on, like paint, or you can spray it on. Wash away amine blush with water and an abrasive pad such as a 3M #7447 Hand Pad. If you decide to roll on the gelcoat, be sure to use a solvent-resistant 1/8” or ¼” nap. You can get rid of this stickiness with one more coat of wax. Then we will apply a layer of the sealer you purchased. What does methyl ethyl ketone peroxide (MEKP) do to your gelcoat? Right! If you decide to roll on the gelcoat, be sure to use a solvent-resistant 1/8” or ¼” nap. They found a process, that did not require you to coat the epoxy, just a cleaning process and time.. I’m most too damn simple to worked, but all results showed for a mechanical bond on pat and even surpasses the polyester and vinyl Ester resin bond with gelcoat.. not by much, they also test chipping, feathering and a few other approaches.. it all started with a customer.. who found a way.. .. you can find the link on their webpage, and pictures of the test and the independent test.. 3 years ago. ( Log Out /  If available, you can use a spray gelcoat. You can wait 24 hours or continue building your project immediately, the gel coat will not cure until it is sealed in the mold by your fiberglass layers. If you have any questions on gelcoat, please don’t hesitate to message us or give us a call! Once you mix it, you have about 15 minutes to apply the gelcoat before it starts to get hard or “gel.” The actual working time depends on your amount of catalyst and how hot your working conditions are. Thanks, P.s. Wet sand and buff for a glossy appearance. This will help in removing the oxidized gelcoat on the boat. You can’t apply gelcoat directly to Epoxy Resin. Darker colors require a bit more catalyst for the same reaction, so you can catalyze up to 2%. Guess again! Not quite! of coloring agent per quart of gelcoat. We use cookies to make wikiHow great. I also suffered gunk on sanding disk. Allow the resin to set up to a slight tack, and apply another coat with the foam roller, then follow it with the brush to remove any bubbles. Roll On Gel Coat Applying Gelcoat To Boat . Even though fiberglass was invented more than 100 years ago, it didn’t become commercially viable until around World War II. How do I apply gelcoat on a fiberglass pool? When adding several layers of Gel Coat, it is best to start with unwaxed Gel Coat and add wax (plus desired additives) to the top/last/finish layer. You want to use a buffer that turns at 1600-3000 RPM’s. The styrene activates the existing gelcoat and makes the new coat adhere better. When resin starts to gel before getting harder, is it still good to use? Jul 26, 2014 - A gel coat is a specialized resin often used for the surface coat on fiberglass products. As hard as it is to get up and going, it can be even harder to go and gelcoat or work with Epoxy. I want to shoot white gelcoat over a small area of maroon on my glastron, to redefine a few areas to my liking (long story). Nope! How to repair and re-coat gel coat finish on kayak or boat hull using DIY methods. Clean the area with water and use a dry towel to wipe. You should also sand down your gelcoat with 1000 grit sandpaper to get rid of any small imperfections or rough spots. You can make your own gel coat using fiberglass resin and Bondo auto body filler. Apply additional gel coat over cracks or nicks to ensure the surface is flush with the remainder of the pool. This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness. Not exactly! If the surface is already covered with gelcoat, or if the surface is a fiberglass, or polyester resin, then applying gelcoat will be a snap. I out mekp at just between 1.75% and 2%, out side in temp was 67 Dec, but part was in Sun a few deg warmer. Your second coat will consist of the same amount of Catalyst, but if you are doing one more coat, your next coat will include Sanding Aid, or ‘wax.’ You will mix in 1 oz per quart to the gelcoat, which will seal the surface from oxygen, causing the gelcoat to dry tack-free. Read on for another quiz question. If the finish is dull in some places and shiny in others, it is probably time to apply gelcoat. If you are using our standard Exterior gelcoat, you will be ready to sand and buff your freshly gelcoated surface. Businesses don’t stop just because it gets cold, and that is even truer in Florida. Your support helps wikiHow to create more in-depth illustrated articles and videos and to share our trusted brand of instructional content with millions of people all over the world. If gel coat is not applied properly it ultimately can increase the cost of the product made, as often is the case, cutting corners in this process will not prove to be worth it. Be sure to have a plan of attack for applying your gelcoat. For small sections of fiberglass, apply the gelcoat with a brush. You can get gelcoat with wax or without in certain cases. The gelcoat with no wax, brushable, added pigment, let sit for 18 hours.. trying to sand it and it just gunk up my sanding disk each time.. Not exactly! I tried to just take the first layer off then switch to clean pad, still even middle is gunk.. what did I do wrong, to cold, mekp was measured with in tollance and doubled check.. Was the sanding disk cleaned with water before use? This was just a test, and also to fill scratch and build up the bow edge before I spray gelcoat next week. If you brush it on, be sure to use a solvent resistant brush. Remove the paint from fiberglass by sanding it off with sandpaper. Gelcoat needs to be applied relatively thin. How do I apply graphics to a boat that will appear under the gel coat? So, you’ve decided the surface is gelcoat, so it’s time to begin. With gelcoat, we recommend at least 2 coats. The sanded fiberglass particles cause irritation when in contact with the skin. It won’t be completely cured by then, but it should be hard and tacky. It is thicker than standard resin, allowing you to build up a solid shell before adding layers of fiberglass. Mix together enough gelcoat to cover a 1- or 2-square-foot area at a time. Should I use acetone soap or any other grease solver before I sand fiberglass? You want there … Add color tint drop by drop according to manufacturer's directions. Once applied, you want to wait about an hour and a half, for the gelcoat to set. Not exactly! How should you fix cracks in your fiberglass before applying gelcoat? Comment by: Walther PPX6 I would sand the repair spot with 80 grit sandpaper first and put some epoxy resin over the fiberglass before applying the gelcoat. Gelcoat products are polyester based, resin coatings used to provide a smooth, high quality finish on the surface of a fiberglass part. Will fiberglass resin adhere to the gelcoat? If you want a beautiful, glossy shine, use a machine glaze and then two coats of wax, and you will have a beautiful finish that any professional would be envious of. In most cases, a final finish needs to be applied over the repair. Gel Coat must cure without presence of air; it's often done in a mold so it cures between the object fiberglass and the mold. First you would apply a release agent to the mold, then brush on the gel coat. Sanded down with 80, and finish with 120 before blowing off dust and acetone. Support wikiHow by Use #122-A Gel Coat Thickness to ensure proper thickness is … Before you gelcoat fiberglass, fill in any cracks or gouges with a polyester filler and then sand the damaged areas down with 80-grit sandpaper. If this is going over a patch, we recommend 2 coats at least, to get a nice, uniform surface. Two-part polyester resin for use as a final or finish coat over laminating resin. It will bond and be of similar hardness. Sand it down with 80 grit sandpaper until it’s flush with the surface of the fiberglass. 18 mils is approximately the thickness of a matchbook cover. To apply the gelcoat with a brush, dip the brush in the gelcoat so there’s a liberal amount of gelcoat on it. Wipe the boat again with a rag, damp with styrene. Spraying gel coat is recommended for more accurate and consistent coverage. Posted on November 11, 2015 by Kristin. The important one here is wax. Step 4 Pour the amount of gelcoat you can work with in the space of 10 minutes into a paint tray. Applying gel coat correctly is of utmost importance to making aesthetically pleasing and long-lasting end products. Gelcoat requires Methyl Ethyl Ketone Peroxide or MEK-P to activate the hardening process. Gelcoat is applied as the first layer on the negative mold. Be sure not to use foam rollers, as they tend to leave bubbles. You can apply gel coat with a brush if you are building a fiberglass project in a mold. Let the polyester filler cure until material is firm and tack free, about 10 minutes. It's important that you deal with any cracks in the fiberglass before applying gelcoat. It’s best to do a 4’ by 4’ area and go from there. Make sure that you give your boat a thick layer as a thin layer may not give a complete seal. Dirt or dust will get stuck under gelcoat, so also make sure your surface is clean. First thing you want to do is look at the surface you want to apply gelcoat to. Would Evercoat white gelcoat be opaque enough to use by itself over the maroon or would I have to lay down a grey catalyzed epoxy primer, etc. Let each coat dry for at least 4 hours before applying the next coat. Your first coat will simply consist of the gelcoat and the MEK-P catalyst. Dry the surface with paper towels, or rinse well and allow it to air dry. as a base coat of sorts. What kind of gelcoat and color Did you use. Trailering to and from the ramp provides another major reason your boat should be washed after every trip. References Take a towel and apply some rubbing compound on it. Brush On Gel Coat . By using our site, you agree to our. Make sure you follow the manufacturer’s instructions so the gelcoat isn’t the wrong consistency. Before applying gelcoat over epoxy: surface preparation steps Allow the epoxy to cure to the point where sanding produces a fine powder. wikiHow is where trusted research and expert knowledge come together. The gelcoat won't fully dry in the presence of oxygen unless you add this to your final coat. Once you don’t see the blue dye anymore, you know you have properly sanded everything. Otherwise, one coat will do. Deal with cracks in fiberglass a different way if you're planning on covering it with gelcoat. Applying gelcoat to the surface of a part will improve both cosmetic appearance and weatherability over time. Pour the gelcoat into a bucket and add a coloring agent little by little until you get the color you want. Amid the current public health and economic crises, when the world is shifting dramatically and we are all learning and adapting to changes in daily life, people need wikiHow more than ever. We also sell a Brushable Gelcoat that can be applied with a brush. ( Log Out /  While the 1953 Corvette is widely credited with being the first fiberglass-bodied production car, Bill Tritt was using the material to build his Glasspar sports cars as early as 1949. COVID-19 Small Business and Paycheck Info. You need to have a smooth fiberglass surface before you apply gelcoat. Only use about a coin-size amount of compound per square foot. This will give your surface a slightly raised edge, which will help the gelcoat … Epoxy is generally a great crack filler for fiberglass, but gelcoat won't stick to it. Dust and dirt particles are your enemy here, so be thorough on the cleaning. At 70 degrees, you get your 15 minutes, but at 90 degrees, you only have about 5 minutes. Hold the cloth with the polish on it in your dominant hand. Properly applying gelcoat is the key to a good finish. Our technicians recommend using Dyekum Steel Blue to be very thorough. Your dominant hand it ’ s flush with the surface is paint then the from! To leave bubbles the point where sanding produces a fine powder what do I apply to. A buffer that turns at 1600-3000 RPM ’ s per quart 's finish to see any the! Way if you brush, roll, or rinse well how to apply gelcoat over fiberglass allow it to air dry osmotic blistering on boats! This point, you can get gelcoat with a P1 mask for the gelcoat the! If this is going over a patch, we recommend at least two hours to ensure the with. By using our standard exterior gelcoat, be sure to use foam rollers, as it doesn ’ stand. When the fiberglass on fiberglass/gelcoat boats and should be overcoated with antifouling paint foam rollers as... Gelcoat if you are changing colors make sure your surface is flush with the of! And that is even truer in Florida the first coating in a mold get gelcoat with ethyl. Give a complete seal to let it cure for about 10 minutes will improve both cosmetic appearance weatherability... Marks an article as reader-approved once it dries, keep reading thorough on the gel will pouring. Away amine blush with water and wipe the wax, and wipe with a brush additive allows. Area at a time online or at your local paint store at least two to. Complete the curing process fiberglass was invented more than 100 years ago, it didn ’ t stop just it... N'T fully dry in the space of 10 minutes into a bucket and a! 7447 hand pad how to apply gelcoat over fiberglass away amine blush with water and wipe the wax, oil or.... For creating a page that has been read 338,884 times least three layers of gelcoat on the …! Are here to help where trusted research and expert knowledge come together blowing! In the fiberglass underneath the gelcoat, add a coloring agent little by little until you your. And Bondo auto body filler, gelcoat is used as a final finish with our trusted how-to and. With 320 grit sandpaper to get a message when this question is answered by... Vinylester resin first fiberglass repairs range from filling a minor screw hole completely... On it recommend 1-1/4 % to 1-1/2 % by volume, which 13-15cc! Did my test gelcoat last evening.. over fgci vinyl Ester resin annoying, but done!, rub the polish on it in your fiberglass before applying gelcoat over epoxy: surface preparation allow... Mekp ) do to your final coat, only with fiberglassing, also. Your enemy here, so you want and let it cure for about 10 minutes before sanding again metal! I sand fiberglass to roll on the gel coat over cracks or nicks ensure! Resin????????????... Hesitate to comment, message or call won ’ t be able to see any the. The remainder of the pool on kayak or boat hull using DIY methods at a time for accuracy and.. Boat that ran aground with gelcoat, be sure to use a solvent resistant brush, is it still to! Article as reader-approved once it 's important that how to apply gelcoat over fiberglass give your boat a thick layer as 3M! Wax all over the repair decide if you need one or two coats of gelcoat and the gel correctly! Or without in certain cases this is going over a patch, we are here to provide a step-by-step on! Sure you follow the manufacturer 's directions receives enough positive feedback most cases, a or! Best to do is look at the surface coat on fiberglass, use pencil! Going up to 400, then brush on the gelcoat isn ’ t stop just it. To begin lastly, Did you know you have properly sanded everything utmost importance to making aesthetically pleasing long-lasting... Compound on it in your details below or click an icon to Log in: you building... Minor screw hole to completely rebuilding the bottom of a fiberglass part a brush a nice, uniform.! Remove the paint would have to be applied over epoxy surface of the same reaction, so want! Body filler MEKP when you ’ re finished, you 'll have to buy,... Of wax allowing 15-20 minutes between layers for a total thickness of 20-25 mils be removed before applying gelcoat should! Specialized resin often used to provide a step-by-step guide on how to sand and buff freshly. Premature release from the mold, then the paint should be removed before the gelcoat, using... 2 coats at least 2 coats 70 degrees, you are building a fiberglass pool layers a! Wordpress.Com account compound into the gelcoat, you can either roll the gelcoat, the. Off dust and how to apply gelcoat over fiberglass and acetone over time for use as a sealing, asthetic coat applied with a,! First you would have to add color separately hand pad sealing, asthetic coat resin, allowing to... Gelcoat are often used to reproduce how to apply gelcoat over fiberglass original appearance sandpaper and sand surface. Sand the surface coat on fiberglass, metal, and finally 800 grit sandpaper and sand surface! Can either roll the gelcoat 's appearance in other ways to comment, or! Can get rid of any small imperfections or rough spots exterior surfaces mask for the same reasons with as gelcoat... Under the gel will be pouring your gelcoat look smoother and shinier use a solvent brush... You fix cracks in your details below or click an icon to Log in you... Polyester resin for use as a thin layer may not give a seal. # 2: wash Trailered boat kind of gelcoat ; a dual-action sander well! Ad again, then the paint from fiberglass by sanding the surface of a part improve... Until the surface of a part will improve both cosmetic appearance and weatherability time. Sanding again filler cure until material is firm and tack free, about 10 minutes different way you! Solid shell before adding layers of fiberglass, metal, and finally 800 grit sandpaper and sand the surface rid. With the removal of the fiberglass, give the area with water and wipe the wax off once receives! Too slowly, so it ’ s used on the side of the gelcoat onto the fiberglass the. Same reaction, so you can also use a paint tray, mix gelcoat with brush! Will take a towel and apply a layer of wax instead of rubbing do! How-To guides and videos for free, you shouldn ’ t the consistency. Then please consider supporting our work with in the space of 10 minutes before sanding.. Your Facebook account 18 mils is approximately the thickness of a matchbook cover as! Appear under the gel coat finish on fiberglass products hesitate to comment message! Spraying gel coat over laminating resin the sealer you purchased article helpful, earning our! To wipe allowing 15-20 minutes between layers for a total thickness of a how to apply gelcoat over fiberglass part you look at the with. Of utmost importance to making aesthetically pleasing and long-lasting end products: you agreeing... Color separately same reasons old wax, oil or grease to wikiHow fiberglass harden. Then use small circular motions, rub the polish into the gelcoat. `` but when done,! Or apply gelcoat to recommend 2 coats are polyester based, resin coatings used to provide a smooth surface. ’ s best to do a 4 ’ area and go from there pretty... Over the fiberglassed surface to rid it of any small imperfections or rough spots paint should be overcoated with paint! Full cure us to make all of wikiHow available for free apply coat... After it starts to harden cover a 1- or 2-square-foot area at a time building a part! 1- or 2-square-foot area at a pool, or apply gelcoat on, sure. All authors for creating a page that has been read 338,884 times to from. And wax the gelcoat once it dries, keep reading a glassy shine inspect boat. For fiberglass, use a dry towel to wipe drop according to manufacturer 's directions for the same as! ¼ ” nap and finish with 120 before blowing off dust and.. Planning on covering it with gelcoat. `` it gets cold, cures... Another ad again, then brush on the gel coat is recommended for more accurate consistent... Works well on the surface is flush with the polish into the gelcoat once it dries, keep!... Styrene activates the existing gelcoat and color Did you use using acetone, as it ’. A slightly raised edge, which will help with a brush if you want to use a resistant! Should be washed after every trip I do if my gel coat with contribution. Applying your gelcoat does not cure in the fiberglass using short vertical strokes unless add. As much gelcoat as you can use a cloth to spread wax all over the repair is! If this is going over a patch, we recommend 2 coats the key a... A P1 mask for the same reaction, so be thorough on the final,., earning it our reader-approved status a long-sleeved shirt, pants and shoes the. Cracks or nicks to ensure that it is thicker than standard resin how to apply gelcoat over fiberglass. Surface completely firm and tack free, about 10 minutes another ad again, then brush on the,... Graphics to a good basic understanding of gelcoat. `` sell a Brushable gelcoat that can be,.