Try it on a small and inconspicuous place first...
There was a product like this (or maybe this product); that really buggered-up a coaches finish about a year ago.
I'm not saying that it's not good... it's just that we've heard of some disasters along the way, and it pays to be cautious.
"What: me worry?"
Good Sam Member 843599689
Current coach: Tiffin Wayfarer 24 BW