If you are talking about a large area, doing a good gelcoat job is not easy. Gelcoat is generally used inside a mold and it takes its surface from the mold. The problem with trying to spray it is that it is not selfleveling like paint and so it takes lots of effort to spray it on, sand and buff to a good finish. What most people do is cover the gelcoat with awlgrip or some other good paint. In the end, paint looks better, lasts longer and is much easier to do and will cost less. You can talk to Jesus at Marina Seca about gelcoat but I doubt if there is anyone there with much experience. I have been in and out of Marina Seca for many years and have never seen anyone doing a large area gelcoat job. There are good painters at Marina Seca and probably at Marina real as well. Even if you have a relatively small area to do, eg after some repair to the hull, if the boat is old enough that the gelcoat is starting to chalk or craze, you still might be ahead to paint the whole boat instead of patching the getcoat.
