Use Aircraft Stripper - available at finer auto stores
everywhere. start with a gallon - you'll use it.
it's nastier than normal stripper, but it works better
and you don't have to use as much of it or wait as
long for it to work either.
I'd normally recommend something more environmentally
friendly, but if you try it, you'll find it just
doesn't work well at all on zolatone.
Toby