Know this is an old thread, but adding my experience with paint stripper in case it helps someone.
My doors had several layers of cracked and chipping paint and some cracks and missing gel coat so need to get down to the gel coat to do repairs.
Purchased the attached 'environmentally safe' and 'fiberglass safe' stripper from Amazon and it seems to work pretty well on the carc. Put it on for about 6 hours at 70 degrees and covered with a paper similar to wax paper (vinyl backing) , then scraped lightly what came off easily and then pressure washed. Thought it removed a lot of the paint pretty easily. Will probably hit stubborn areas once more, then finish with sanding. Passenger door is worse as far as gel coat condition and cracks, so will tackle that next.
Rear doors in pretty good shape, so just plan to lightly sand and repaint them.