...and do a test patch first! I used Krylon Fusion to camouflage an old power head and it dried nicely on the plastic of the power head itself, but the plastic cord NEVER fully dried. I let the whole thing hang on a sunny porch for a WEEK. The power head was dry to the touch in an hour, and apparently fully cured by the end of the week, but the cord was still sticky. Two months later, the power head is still not in my tank because the dang power cord is STILL tacky, and I do not want to risk it. (I have tried scrubbing the paint off the cord, with minimal improvement...arrghh!)