Looking for suggestions on dissolving the Bob Dively masking. I applied the mask to my canopy a few months ago. I used it to mask when I sprayed polyurethane clear. I left it on as to protect the parts during the rest of the construction. Now It will not come off except for scraping it using my thumb nails. I tried using a wooden scraper but didn't have much success. I tried denatured alcohol and this doesn't soften it either. I don't want to use anything else to scrape it for fear of scratching the clear plastic.

Thanks for your suggestions.

JC