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Best answer is to clean it off immediately while it is still wet.

Once it has dried, it depends on the material the bathtub is composed of. If it's porcelain, use some lacquer thinner to melt the primer, then clean off the residue and polish. If it is fiberglass or plastic, then any solvent strong enough to remove the cured primer will also damage the surface of the bathtub. Use a razor blade to scrape off the primer, being careful to not damage the surface.

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12y ago

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Q: How do you get Kilz primer off bathtub?
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