There are two main types of gel coats- general-purpose gel coat and tooling gel coat. Both are polyester resins that use MEKP as the catalyst. General-purpose gel coat is softer and more flexible than tooling gel coat. It will flex and not crack under constant vibration. Tooling gel coat is harder and does not scratch as easy as a general-purpose gel coat. This makes it ideal for molds that will be used many times. Gel coat comes in a wide variety of colors. We can even color match.
It is recommended to spray the gel coat. It will need to be thinned with styrene monomer before spraying. It is possible to brush on gel coat but the finish will be far superior if it is sprayed on.