Finally finishing up our Skerry, we painted the hull last week, and I'm having a terrible experience so far with the Toplac Plus paint. We keep getting blisters in the paint, generally but not exclusively along the strakes that are most directly exposed to sunlight. Also, I rolled the skerry over this morning to do some sanding on the inside, and the act of rolling it over on sawhorses scratched the paint (two coats) down to bare wood. It's most likely user error, but I'm feeling very frustrated, any tips or advice would be appreciated!
Are you painting outside exposed to direct sunlight. In rolling the boat over you mention that you scratched the boat down to bare wood. Did you not prime the boat before starting with the finish coats?
I don't know Toplac, it's a different chemistry than Brightsides, the standard polyurethane. However, I do know that Brightsides takes quite a while to harden up, longer I think than the "book" says. Also, don't rush second coats. I did w/ Brightsides and I don't know if it was "blisters" but got some orange peel type issues. I think it was because the first coat hadn't really cured yet and was still evaporating solvents, and this was more than a day later. I gave up and did very thin coats and waited extra time...so I could sand lightly and not have the paper gum up. I'll bet toplac isn't that different in that respect.
I am not widely experienced with various paints but I just put Toplac Plus on my Guider project. I faired the hull with a microballoon/epoxy coat and again with Interlux Pre-Kote (so much sanding!). I put 2 coats of white over the primer and 3 coats of blue on the sheer strake. I had little trouble and no blisters. I do think you have to be careful to not put it on too thickly and let it completely dry between coats. In just a few places on my boat a thick paint layer skimmed over so there was uncured paint underneath a covering of paint that felt dry to the touch. Ultimately it might have all cured but I didn't take the chance and removed the paint from a few small areas where it was too thick. I am not sure what is causing your problem but if possible I wouldn't paint in the direct sunlight, I would put on as thin a coat as I could manage, and I would wait for it to dry thoroughly everywhere before recoating.