these are LPU coatings - linear polyurethene. Just like 2 part auto paints. Two flavors - acyrlic polyurethane and polyester polyurethane. Sell for about $100 - $200 a gallon in industrial non marine settings.
a cheap way to go is to use a regular enamel as the pigment coat and then a clear 2 part lpu topcoat. Make sure the 2 part clear has lots of uv blockers (like found in 2 part lpu auto clear coat) - not avaiable (as far as I know) in any 'marine' lpu .
The week link with lpu coatings is their adhesion. they need a primer - generally a thinned epoxy but other 'fresh' solvent based coatings seem to work too.
google LPU coatings or PLU polyurethane etc. to learn more about this class of crosslinking coatings.
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