Equipment for applying gel coat in open or closed mold processes
The gel coating process
Gel coating of open molds is often the first or final part in the production process. The material is a highly pigmented form of unsaturated polyester resin which can be pigmented to the desired product color or the de-molded product can be post-painted.. When it is catalyzed with MEKP (Methyl Ethyl Ketone Peroxide) it yields a very durable, aesthetically-pleasing finish.
Spraying gelcoat is done in multiple passes to achieve a thickness of 15 to 25 mm. The gel coat is typically catalyzed at 2% (by volume) and will have a gel time of 30 to 45 minutes. The mold will be ready for the next operation in 2-3 hours. Gel coat is applied onto the mold in multiple passes. Most material suppliers recommend at least 2 or 3 passes to build up desired thickness.
But gel coat alone does not have the structural strength to be removed from the mold or to be used as a final product, so another material must be added for reinforcement. This second step in the process is called lamination
Graco offers complete solutions for all your gelcoating needs
Graco’s gelcoat system offers you assurance that you achieve a high quality end product. By purely using Graco components that are proven in multiple industries, you will have a solution that is technologically advanced, durable and long lasting.
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