I was cleaning the boat today with Spray Nine,and on the outside of the hull,noticed that the paint was coming off as i scrubbed.Not down to bare metal,but it definately thinned the paint.This is not a big deal,since I plan on painting the boat this winter,but a heads up so nobody runs into this problem.The paint was in descent condition,not chalky or peeling.The paint on the inside of the boat is fine.