We've had a few discussions about this here in the past.

I've just finished trying some Removall 220, as recommended in
Practical Classics, and ... it's brilliant. I had to leave it for 24
hours to do its stuff, but by then the paint - although it looked
unaffected - just lifted off, right back to the gel coat. Far, far
easier than any other paint stripper I have ever tried - I wish I'd
known about this stuff when I did the DS roof a couple of months ago!

I have no connection with the people who sell this stuff (Cirrus
Systems, www.paint-stripper.co.uk) except as a happy customer.

Ian