I have a 1984 Scarab III which has very small blisters less than .25'' and a bunch of them. I need to do something about these, but I don't want to spend a lot of money redoing the bottom. I keep the boat on a trailer. Does anyone have any advice on the best and most economical way to fix the bottom. The gel coat is red and there is a lot of oxidation. I though of leaving them because they are so small, but I am afraid if I lightly sand the oxidation off, the blisters will break.

theres not a whole lot you can do with them short of "peeling" the gel off and re gelling the surface. The problem is the bond is already compromised inside each little blister, freeze ant thaw cycles are very hard on them. Wish there was an easier way but anything short of getting to the bottom of the blisters is a temporary fix at best.

If you are trying to do it cheap. Get a DA, and 320 grit. Hit it with 320 most gel on these boats are super thick and you can sand out the blisters. IF they arnt huge. Once you hit it with 320 wet sand with 600/800/1000 and buff it. But if the blisters are Bad you're going to grind them out. Add a couple sheets and build it out and body work it. Both cheaper and easier imo than stripping the bottom and re gelling.

I have a simular situation as mentioned in an earlier post. The blistering on mine cover the entire bottom and they are tiny. Like small pimples. The largest ones are still a fraction of the size of a dime. When they are poped (like when I power was it) the underside is dry. I'd assume they should be wet from moisture, but they aren't .

I'm wondering if the bottom is hit with a D/A and some 320 (assuming they all pop) can I just roll barier coat over it? Hoping the barrier is thick enough to fill the pock marks and then bottom paint over the barrier coat

Could this be a viable solution for me or the OP, or am im wishfuly thinking.