technical question

[kickingbug1]

as always educated  people with good advice

[JBC]

I'll add my .02 cents here.  Trailerable sailboats that don't spend much time in the water don't need bottom paint.  Period. Removing the old ablative paint is probably a good idea for both performance and appearance, and the barrier coat that is left should be just fine as a sufficient coating, assuming it meets aesthetic requirements.

But if I were going to paint the bottom of a trailer boat, I would choose a micron paint.  Tain't cheap, but does very well sliding on and off trailer bunks from my experience and holds a good look for a long time.  That old ablative paint would need to be pretty well gone before the application.  

All this said, no genuine bottom paint will work well for its intended purpose if it rarely hits the water.

Jett