We used Captain John's Boat Brite Soy stripper a month or two ago to take old bottom paint
off, and it worked well enough. We did wind up needing to use saran wrap to keep it wet long enough for it to work, and paint
it on *really* thick. I'm not sure if the Franmar stuff is the same, but it's probably similar. We let the soy strip sit for 6-10 hours before scraping it, since it didn't work much faster than that.