Always test a small area for product compatibility. Some non-primed, non-catalyzed paint may be seriously affected by this product. Occasionally temporary softening has been reported mostly on recently painted equipment and aged surfaces with heavy oxidation. Painted surfaces returned to their previous condition when VINYL-OFF evaporated or was gently rinsed with water or both. Paint that was not correctly cured prior to graphics being applied (common in aftermarket repair work) may be an issue no matter which method of vinyl removal is used. Is it vinyl? Vinyl-Off only removes vinyl. If the product you are removing is not vinyl, or if it is coated in such a way that the Vinyl-Off cannot get to it, it may react differently, and sometimes not at all.