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Hi,
As JB says...paint thinner...and plastic putty knives/scrapers of various sizes and shapes.
If you're to not paint the underbody you don't want to damage the fiberglass surface.
Regards,
Alan
Heat gun will work quite well also. Give it a try...you might be amazed. That is how I get the major thick areas off. And this is due to I am not wasting thinner..and i do not have to worry about the vapors.
Then I will do the rest...if needed... with the lacquer thinner.