Let us consider relative risks of boating things. We all know of
accidents caused by keels falling off external keeled sailboats, if
not, google Mike Plant. Yet, I have never heard of an accident caused
by blisters. This means that external keels are far far more dangerous
than even the worst case of blisters. So, should I reject all boats
with external keels? Actually, I would.
I have never heard of anybody being adversley affected by blisters
while they were on the water. Considering that many people here who
would not have a boat with blisters actually sail even when they are
near thunder storms, you have to wonder about their perception of
relative risk. The risk of lightning strike even without thunderstorms
is probably thousnads of times higfher than being affected by blisters.
I have heard of prop shaft breakage sinking boats but have never keard
of problems from blisters while on the water. Considering the relative
risk of blisters causing problems, I have to conclude the risk is
relatively non-existant.