Damn, many years ago someone I was talking to was in the business of
sandblasting the inside of fuel tanks and other places with nasty
chemicals and he was complaining about the volume of the sand to be
disposed of as hazardous waste. Off the top of my head with no
experience in the field, I wondered aloud if blasting with dry ice
would work as there would be no blasting media residue. Now, I see
from Lew Hodgetts post that this is now being done. Is'pose I am not
dissapointed, If I really wanted to, I woulda patented it then and
there.

Hmm, maybe apply microwaves from the inside (or outside if the paint is
non-conductive). The microwaves will heat the water in the gelcoat and
cause the paint to spall from the surface.............