One more thought...
I'm anal too. However, when I bought my boat, the dealer said, just wax it. So that's what I did.I have slipped it since the first day I launched it, but our seasons are pretty short. One year, we had a mild winter and I left it in all year (February sailing in Buffalo is rather rare)...however, when I pulled it the following fall (about 18 months in the water) I had little bitty gel coat bumps on the bottom.They weren't osmotic (or I should say, they weren't wet and didn't go through the gel coat), but being anal, I sanded, barrier coated and started using anti-fouling paint (although I despise ablative).The best thing to do is keep an eye on it. If you start seeing little gel coat pimples, it's probably prudent to take action.