Well,I did the paint thing on my last boat but even then I still used gelcoat on the flippers. It's just easier to fix and maintain.

Gelcoat is easy to work with. It can be sprayed with a Preval after a little thinning . If you decide to use gelcoat or want more info let me know.

Are your reservations about the two part paint cost? If so most people don't know that Imron is availible in an industrial version which is less costly. For example I purchased a gallon of clear with kicker for 75 dollars. The clear was ready to spray. No thinner. I'm sure white is available. Of course Imron is not something to mess with unless you protect yourself.

Sherwin Willams automotive paint divison sells a product called Sunfire which is their version of a polyurethane and is availible in quarts. Not sure if the Ind. Imron is.

Any ?'s ask away. I'm not sure how much you know about these things.