The gelcoat the speedminded is talking about is sprayed on just like regular auto paint, but its between 2x and 3x as thick, and requires special sprayers designed for gelcoat. Usually a CF part is made with either epoxy resin (more flex, turns yellow in UV light) or a polyester vinyl resin (brittle, no yellowing but can cloud). I usually use a surfboard gelcoat for my final clear coat which needs an extra sanding aid added, but I know that better ones are out there. If all you care about is having the CF look rather than actual weight savings, then any polyester clear resin/gel will more or less work. If you have an epoxy only CF part, then you shouldn't care if yellows or not, as it was designed for weight saving purposes and not to look pretty. Sadly, with out getting very expensive, there is no real middle ground.