Even the most careful painter can splash or drip. When the splash or drip is in your fiberglass tub, it's hard to know what to do. If you want to try removing the paint yourself rather than hiring a professional, there are several cleaners that might do the job without harming your fiberglass tub. Spot test all methods to be sure your finish won't be damaged.
How to Remove Paint From a Fiberglass Bath Tub
Scrape paint off the fiberglass tub carefully with a plastic scraper. Clean with Barkeeper's Friend and water. Rinse thoroughly and repeat if necessary.
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Try Dirtex in a spray can to remove latex paint from a fiberglass tub. It's available from ACE hardware stores.
Make a paste of baking soda and water. Rub the paint spot with the paste and a damp sponge. Rinse completely.
Rub the spot of paint with a dampened Mr. Clean Magic Eraser.
Scrub the paint spot with a non-abrasive powdered cleaner like Bon Ami.
Visit a paint company and look for "Oops". It's made to remove paint spots.