The Stovebolt Site Forums The Shop Area Paint and Body Shop phos acid, how should it look when done

when it's 'left on 20 min' it needs to be continuously applied to prevent that stickiness .... note they say keep wet, not an easy thing to do on large panels or complex shapes ... also the primary purpose of it is to neutralize rust and it is meant for bare metal

Woody - when you wipe on with a rag and wipe off the 'excess' right away you're not giving it enough time for the chemical reaction to occur, that's why they say 'keep wet for 10-20 minutes', rinsing it with water shouldn't leave a coating of rust if it's had time to change the iron oxide to iron phosphate, which doesn't rust

Bill