Brian,
The Paint Remover sold in the auto stores used for flexible bumpers. The "Aircraft Remover" product is not compatible with plastics but the other version for Flexibe Plastic Bumper is and helps a bunch. Buy the hard plastic scraper that's usually available nearby to scrape the goop off. I got two layers of paint and primer off a used F-22 project I'm working on this way. About 90% of both coats came off and the rest was sanded off by hand or an electric sander. You'll have to rinse the surface off with water after scraping the paint off to neutralize the chemical reaction.