Much Thanks! to all for the replies. We decided to use ablative paint because we are not sure if we will leve it in a slip. Since I built the trailer good enough to bring the boat back here to the Gulf from Ca. Taking it back and forth is one of the options, depending on hour hard it it to step the mast ourselves. I might leave it in April through December and them bring it to the house for a refit each year during the four coldest months. The Gel coat looks good, no blistering found so far, but it is 36 years old. I tried my on sand blaster but the sanding seems to be faster. Luckily we're at the end of a dead end street. I don't complain to my neighbor about how loud his Harley is so he can't complain about the sander's noise.