What is the final thickness of gel coat after curing?

The final thickness of gel coat after curing is typically around 18 mils. Gel coat serves as a protective layer that provides a glossy finish and enhances the aesthetics of composite materials. During the application process, gel coat is usually sprayed or brushed onto a mold surface at a thickness that accounts for some material loss during curing and finishing processes.

In practice, the application thickness might begin higher than 18 mils, but due to factors such as solvent evaporation, potential sanding, and other finishing operations, the final cured thickness stabilizes around 18 mils. This thickness offers an optimal balance between durability and smoothness, which is critical for achieving a high-quality finish on composite surfaces.