polyester won't bond to epoxy and that is the base of gelcoat is. Sold as a kit (resin and hardener). It is brushed on and then flecked with a spray gun. Carbon isn't lighter than glass. Vinylester is considered to be a hybrid of polyester and epoxy. Polyester is an adequate adhesive but not as good as epoxy. The most common gelcoats are based on epoxy or unsaturated polyester resin chemistry. Epoxy And Polyester Resin Compatibility As a general rule, the tensile strength of a polyester bond will be around 20 percent weaker than the same bond made with epoxy. * Lastly, the bonding surface needs to be well scuffed with sandpaper to ensure a good mechanical bond. Just wondering why you did not test the high build???? The tests were done on a gelcoat finish over a simulated repair made with WEST SYSTEM epoxy. * Cure time and temp. hull paint, gel coat, epoxy, vinyl ester, polyester compatibility question. As epoxy is chemically very different to polyester, it doesn't react with the surface, leaving it partially uncured. The use of Resoltech 1050 epoxy resin is recommended. An epoxy's relative strength can hold up to 2,000 lbs. How to successfully apply a gelcoat finish over WEST SYSTEM Epoxy. You may either roll the gelcoat on, like paint, or spray it on, to apply the gelcoat. Polyester gelcoat is not recommended for finishing repairs below the waterline. MEK Peroxide Catalyst for Gelcoat/Polyester 2 ounce $ 3.99; Add to cart; Polyester Resin, 1 Gallon $ 50.98; Add to cart; Facebook Youtube Envelope Instagram . Can I coat the EZ-Fair with 105 Epoxy Resin let it set then finish off with Gel-Coat? The polyester/vinyester gelcoats however are designed to not fully cure at the outside, to give a reactive surface with the backing polyester. And even polyester resins have a shorter shelf life than epoxy. Question 1: Gelcoat is used as a top-coat, epoxy is used as a structural material (as one part of a composite structure of reinforcing fibers and resin or as a putty) and a bonding adhesive. I was reading online about the renovation of a Gougeon G-32 Catamaran. Resin does not have this same property and should only be applied through the use of a molding process such as casting or pour-on coating to adhere well enough on its own. by. Wax a piece of glass or tape out some plastic sheeting. Check out his web site for all the details. Keep in mind that vinylester resins have an extremely short shelf life. by Jeff Wright Vice President of Technical Services. Boats that are dry sailed or trailered have also had good success with gelcoats on underwater epoxy repairs. I really enjoy your site and the You-tube video you provide. Thank you again for your wonderful videos. The manufacturing process for polyester boats has been developed so that a chemical bond exists between the gelcoat and the laminate. The isophthalic gelcoats have inert fillers inside them to make the surface of the mold harder and to ensure the absence of micropores. Suitable for application by brush to give an even film, free from air and drainage. as a Paint, In-mould gelcoat compatibility with epoxy. Most production fiberglass boats are made with polyester resin, and were often asked if its appropriate to use polyester gelcoat over epoxy. I am using a male mold to build a bimini covering for my center cockpit sailboat. Gelcoats are modified resins which are applied to moulds in the liquid state. Its aways best to apply glass onto glass (when possible). document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Because Boatworks Today, its owners or partners cannot control how the information provided through these videos is applied, we will not be held liable for any damages; incidental or consequential. These included using 742 Glass Fabric (6 oz), 407 Low-Density Filler, and 410 Microlight. * A natural by-product of epoxies curing process is something called amine (or amine blush). Gelcoat is not a finishing coat; for fibreglass mould making, it is painted onto moulds/plugs and remains tacky after it cures. I have been using west system to plug holes left in my transom from previous owners accessories. This is because gelcoat cannot be formulated to utilize the most technically advanced polymer chlorine resistant resins, inorganic pigments, high-density UV blockers, adhesion promoters and gloss enhancers . Polyester Pigment must be used for pigmentation. As epoxy is chemically very different to polyester, it doesn't react with the surface, leaving it partially uncured. The only conditions are that the epoxy needs to be thoroughly cured, well abraded and scrupulously clean. Hi Pat! If youre looking to prevent stress cracks from coming back, Id sand the surface down to bare glass, then apply the new material followed by bottom paint. In repairs above the waterline, gelcoat applied over properly prepared WEST SYSTEM epoxy has a great track record. Next video will show the results of the tests! But I believe the manufacturers use an Epoxy based primer that has similar properties to gel coat..However, based on the above information Gelcoat could be used as well. They claim that you can use it as a tie Coat. biaxial glass over meranti marine plywood. Each resealable bottle contains 2 oz. Thank you!! * Presuming the mix ratios are correct, having everything properly mixed is another important step. There are boat builders using epoxy layup over gelcoat in the mold and that works but repairing them is another matter. I am preparing to build a trimaran using a similar technique but his renovation has given me pause. After the Release Fabric was removed, a variety of finishing processes were applied to the panels. When considering this idea, there are a few things to keep in mind (and these are VERY important)! Is it possible to use polyster gelcoat with epoxy resin or do I have to use polyster resin with polyster gelcoat? per square inch. There are good reasons for this concern, but if you understand the materials involved and follow recommended repair procedures, you can successfully apply a gelcoat finish to a boat bottom repaired with WEST SYSTEM epoxy. These customers are concerned about the gel coats long-term ability to adhere to the area repaired with epoxy. Available to buy online in a 1kg and 5kg kit. Opaque, thin paste pigments for coloring epoxy resin, polyester resin, and gelcoat products. Epoxy has a lot of appeal for repair work (extended work times, stronger mechanical bonding, better moisture protection, etc). How do you take care of this? If its not fully cured youre going to run into problems. The overall effect of moisture on the gel coats bond to both the polyester and epoxy panels was negligible. Epoxy Provisioning for Circumnavigating Antarctica, Making Appropriate Structural Reinforcements to Your Boat. I consider it to be an epoxy with a MEKP/cobalt curing system with mechanical properties equal to or superior epoxy, but it smells. The following errors occurred with your submission. Can I still use gelcoat or should I paint instead, after popping the bimini from mold? 30 drops is approximately equal to one cc. Gelcoat is a material used to provide a high quality finish on the visible surface of a composite polymeric material. This is a sort-of obscure question be relevant. Grinding the West System to below the gel coat seems like it will cause leaks in the future. Various Types of Polyester Resin: Copyright document.write(new Date().getFullYear()) Website Acquisitions Inc. All rights reserved. Ideal for color matching gelcoat, tinting epoxy for river tables, wall art, jewelry, and more MIX COLORS EASILY to get just the right custom color for your project However, customers often want to restore the original gelcoat finish to below-waterline repairs where the boat is kept in the water and no antifouling paint is applied. A wide range of Epoxy and Polyester colour paste pigments are available. Our customers fiberglass repairs range from filling a minor screw hole to completely rebuilding the bottom of a boat that ran aground. Can you apply TotalBoat polyester Gelcoat DIRECTLY over a repair faired with an epoxy-based fairing compound? They will slowly polymerize in the can without even adding the MEK catalyst.. Show excellent weather properties. Gelcoats & Paint. I keep hearing that a product call System Three SB-112 is an epoxy that is 100% with Polyester. Epoxy can be compatible with Gelcoat but there's too many variables for me to be a fan of using it. The gelcoat was applied using a pressure pot-type spray gun. I cant speak from experience. If the hardener has not fully reacted with the epoxy resin or the amine blush is not removed from the cured surface, problems can occur. 2. For epoxy resins you could use nitric acid or dichloromethane. Polyester gelcoat can not generally be used with an epoxy resin system to make gel finished parts, however, there is a tie-coat or primer that can be applied over poly gelcoat in the mold. Other GelCoat Features Low Odor, Low VOCs Inherent Chemical Resistance High Adhesion High Gloss Retention GelCoat Product Information Mix Ratio 1.5:1 by volume Working Time 20-30 minutes If below the waterline Ill typically do any fairing with thickened epoxy as it provides a better moisture barrier. Let the gelcoat go tacky but hard as above. There is polyester and there is epoxy. A hour or two later lay up another patch. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This field is for validation purposes and should be left unchanged. Laminate a square of epoxy and glass up one end. Gelcoats are usually created with silicone or latex that will bond to epoxy surfaces without any issues. Either with experience, peel ply or vacuum bag, you can do better than the person who isn't in practice. Warm water and a scotch-bright pad Amine is water soluble and is easily removed. For full size boats, sometimes a layer of vinylester is used between an epoxy hull and the gelcoat. Click here to see this product & more on Fibreglast.com:http://bit.ly/1PtienNremium Gel Coat with over 900 color options! Crystic Gelcoat 252PA is a pre-accelerated, isophthalic gelcoat designed as an in-mould gelcoat with excellent adhesion to epoxy resins without the need for a tie-coat. It is also cheaper than epoxy and a great choice when casting deep molds. A wipe-down with acetone and / or a wax remover both before AND after sanding will remove surface contaminates. think of it like your foundation if your building an house you want it to sit on the best possible footings.
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