Don’t let Fast Etch air-dry on the car. We sprayed several large sections of the El Camino with it and let it sit overnight. When it dries, Fast Etch leaves a tacky coating behind that is hard to wipe off. We checked with the guys at Eastwood, and they confirmed that we messed up. To use the product the right way, spray it on and keep the treated surface wet for at least half an hour. Then wipe the residue away with a solvent like Eastwood’s PRE. If Fast Etch does dry, you can reactivate it by spraying more on, letting it soak, and then wiping it with solvent.