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EP4111 - Waxed Polyester Finishing Resin


GENERAL DESCRIPTION:  EP4111 is a room temperature curing, resilient, clear transparent, polyester finishing resin for coatings.  It cures in the presence of air to a hard, sandable and polishable surface.  EP4111 is often called surf board resin because of the outstanding results in that application due to its hard, tough, crack-resistant nature and clarity which allows graphics to show through.  Successful applications include boat coating, gel coat resurfacing (can be colored to match most existing boats), coating cinder block and masonry surfaces, recoating fiberglass awnings, table top finishing or other surfacing applications.


MIX RATIO: The gel time and cure time are both dependent on three parameters: (1) the percentage of MEK-P catalyst used; (2) the temperatures of all ingredients and the surrounding environment; (3) the mass concentration of the resin, i.e., a solid-cast shape vs. thin film. A good starting point, at 72°F, is 1-1/4 % catalyst by weight. This is equivalent to 10 drops catalyst per ounce of resin, or 1 teaspoon catalyst per pint of resin. This level will result in a 15 min pot life and a 24-hour cure. As temperatures rise above 72°F, decrease catalyst, and vice-versa. Polyester resins will not cure below 60°F. Experiment until the correct ratio is determined for your specific application. In general, mix what you can use in 10 minutes. Apply a thin even coat of EP4111 with catalyst at least 1/16” over entire surface. Let the coating cure for at least 24 hours. If a second coat is needed, the first coat must be thoroughly sanded and cleaned prior to next application. Remember to always wear eye-protection when working with polyester resin and catalyst.


The resultant room temperature curing plastic has these properties:


                                Viscosity                                               500 cps

                                Specific Gravity                                    1.11

                                Hardness (durometer)                         80 D  (32 Barcol)

                                Tensile Strength                                   9000 psi

                                Compressive Strength                         20,000 psi

                                Flexural Strength                                  16,000 psi

                                Maximum Use Temperature                140°F     


EP4111 is available in the following sizes:


                                Quart Kit                                2-1/4 lb

                                Gallon Kit                              9 lb

                                5 Gallon Kit                           45 lb

                                55 Gallon Drum                     500 lb


Qt, Gal, and 5 gallon sizes include the catalyst.  With drums, order catalyst separately.


Warning:  Uncured product may cause respiratory or skin irritation with possible sensitization. Use only with adequate ventilation. If skin contact occurs, wash thoroughly with soap and water. In case of eye contact, flood with water and call a physician. Use of gloves and face shield is recommended.  This product should not be used near food or where prolonged skin contact may occur.


Disclaimer:  This information is based on sources that we believe to be accurate. It is offered in good faith, but without guarantee, since conditions of use are beyond control. All  risk of use are assumed by the user.


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All content © copyright 2001 Eager Polymers, Inc. and may not be republished without permission.