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Polyester Resins
Polyester Resins are the most widely used resins in the composites industry. Polyester Resins are less expensive, offer some corrosion resistance, and are
more forgiving than epoxies. The majority of all fiberglass parts are constructed using Polyester Resins because they are easy to use, fast curing, and
tolerant of temperature and catalyst extremes.#83 Polyester Laminating Resin contains wax to prevent surface tackiness after curing. The wax in this resin rises to the surface during cure and creates a protective barrier that allows the resin to fully cure. This resin should be used on the top or finish coat, or for laminating thin fiberglass skins on plywood. #77 Polyester Molding Resin is a wax-free, general purpose resin. This resin is a great choice for building low-cost molds, or for general part fabrication. #90 Isophthalic Polyester Resin is a durable, dimensionally stable, corrosion resistant resin. The 225°F service temperature and low shrinkage properties of this resin are ideal for making dimensionally stable molds or extremely durable parts.
Want to learn more about Polyester Resins? Fibre Glast has a free Learning Center with helpful white papers like: About Resins, Mold Construction, Molding Fiberglass, and Fundamentals of Fiberglass. You can also contrast Polyester Resin with Epoxy Resin and Vinyl Ester Resin in the Fibre Glast Blog article: Choosing the Right Resin.
Click on a Polyester Resin image below to get more information and view pricing. You can place your order right her on our website or, if you have any questions, call 1.800.838.8984 | 8:00am - 8:00pm EST Mon-Fri.
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Waxed for Top or Finish Coats #83 is a waxed resin for laminating thin fiberglass skins on plywood, or for general purpose fiberglass repairs. The wax in the resin will prevent surface tackiness even when applied in thin coats. Sand off the wax layer before painting or secondary bonding. Stir thoroughly in can before using.
Formulated for 1.25% MEKP. 83/69-A kit contains (1) QUART RESIN, (1) 69-A. 83/69-AK kit contains (12) QUARTS RESIN, (12) 69-A. 83/69-B kit contains (1) GAL RESIN, (2) 69-A. 83/69-BK kit contains (4) GAL RESIN, (8) 69-A.  |
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Wax Free, General Purpose Resin #77 Molding Resin is ideal for general purpose part fabrication and for building low cost molds. An internal thickening agent has been added to prevent drainage on vertical surfaces, yet it retains the low viscosity required for rapid wet out. This resin is wax free to reduce sanding between coats.
Formulated for 1.25% MEKP. 77/69-F kit contains (1) QUART RESIN, (1) 69-A. 77/69-A kit contains (1) GAL RESIN, (2) 69-A. 77/69-AK kit contains (4) GAL RESIN, (8) 69-A. |
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Durable and Stable Resin #90 Iso Polyester is perfect for making dimensionally stable polyester molds, corrosive service part fabrication, and as a durable repair material for tank linings. #90 permits fast wet-out in spray or hand laminates. It's 225 degree F service temperature also resists exotherm and post cure problems. Properly fabricated parts may be used in food contact applications.
Formulated for 1.25% MEKP. 90/69-F kit contains (1) QUART RESIN, (1) 69-A. 90/69-A kit contains (1) GAL RESIN, (2) 69-A. 90/69-AK kit contains (4) GAL RESIN, (8) 69-A. |
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General Purpose #70 Styrene Monomer is the recommended and accepted thinner for polyester resins and gel coats. Most gel coats can be thinned 2-5% to make them suitable for heavy spray equipment or other special purposes. |
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Get a Complete Cure # 71 Styrene Wax is a 5% solution of paraffin dissolved in styrene that may be added to non waxed polyester resins and gel coats to prevent the prolonged tackiness associated with thin sections of polyesters. If the resin contains paraffins, the wax will rise to the surface and protect the curing resin from the inhibiting action of the air. However, if the resin is allowed to fully cure, the paraffins on the surface will prevent adhesion of further coats of resin and must be sanded off prior to additional applications. We recommend adding #71 at 5% for thin coatings. Use with #1040 Hi-Gloss Additive when performing repairs below the water line. |
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Industry Standard #69 MEKP is required with all Polyester Resins, Gel Coats and Vinyl Ester Resin. It is required in different concentrations as defined for each resin product. Each resin product is available as a kit with the correct amount of hardener. However, hardener may be purchased individually as shown here. |
385 Carr Drive
Brookville, OH 45309
Phone: 800-838-8984
Fax: 937-833-6555
Email: customerservice@fibreglast.com
