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Gel coat application guide

Gel Coat Application Guide Introduction Gel coat makes ?berglass reinforced products attractive and practical Technically it is a surface coating of pigmented polyester resin which gels against the mold surface and cures with the structural laminate It faithfully reproduces the mold surface imparts color and protects the reinforcing ?bers from external elements In many cases the surface treated with gel coat is the only part of the structure that can be seen To the user it is simply a reinforced plastic Resins ?llers pigments and promoters are carefully selected and formulated to develop the quality and surface appearance needed to make the product durable and saleable Customer acceptance of the product can depend entirely upon the care and handling of gel coat Several key points must be considered if the gel coat surface is to perform to its capabilities ? Gel coat make-up and realistic performance expectations ? Proper equipment suitable for the speci ?c application ? Skill of the spray operator proper training and experience ? General spray methods ? Special spray methods for speci ?c parts according to size and shape ? Problems and solutions The various components of the gel coat system in uence the quality and working properties needed to provide the performance characteristics for the intended end use The Resin The basic ingredient of gel coat is the polyester resin system which provides the chemical composition that determines the chemical and physical properties of the gel coat Orthophthalic Orthophthalic anhydride is used in general purpose resins where superior anhydride or Rev - Page acid resistance to water and chemicals are not of prime importance For years it has been one of the raw materials incorporated into polyester resins and is still available but is often replaced by the more durable isophthalic types of resins Isophthalic Reacted into the resin isophthalic acid provides greater levels of water acid and chemical resistance than does orthophthalic anhydride This is especially important in the manufacture of boats shower and bath enclosures Greater chemical weather and corrosion resistance with a higher degree of exibility are the immediate bene ?ts when isophthalic acid replaces orthophthalic acid in the resin Neopentyl Glycol When the highest possible quality and performance levels are required neopentyl glycol is reacted into the isophthalic resin in the proper mole ratio This raw material can produce weathering and chemical resistance capabilities superior to resins formulated with other common glycols Pigments Pigments and their quality determine both the color we see and the color integrity which simply means the ability of the color to resist change from exposure to various environments Extenders Fillers Extenders provide the gel coat with proper spraying characteristics and in uence the cured physical properties Thixotrope Most of the viscosity comes from the thixotrope Its purpose is to hold the gel coat on a vertical surface yet allow easy breakup for good spraying properties Accelerators Promoters Regulate gel and cure characteristics of the gel coat Peroxide initiates the gel coat cure Although commonly referred to