You might want to take a look at
Signature Finish paint. Very user friendly, repairable, and made for DIY use with no primer required; used by Capt. Chuck, DonV and others with good results. It's also the only urethane I know of that holds up underwater! Used it for
bottom paint and it's held up much better than I expected! Tom Fabula can mix up any color you want.
The new paint that forum member Joel Shine is selling is another option that appears to have similar characteristics and benefits.