Well, because it's easier to just grind out the blister and relaminate. Much
more effective that trying to get that stuff out on a blister by blister
basis.

"Parallax" wrote in message snip

So, here is another idea for blisters: Useless idea #3729

Since blisters are caused by poor wetting of the skincoat, why not
make tiny holes in a large blister and inject very thin epoxy into the
blisters (after forcing as much water out as you can) and then apply
pressure to cause it to re-conform to the hull as much as possible
forcing epoxy out the many holes. There are also materials (think
superglue) that polymerise in the presence of water, maybe inject
them.

Since the professional "repairs" ussually fail, I feel justified in
suggesting ideas.