The acid wash is common before gel coat restoration
, not drastic at all. Even teak
decks are cleaned with acid! The On&Off product is biodegradable but you must take care while using it to keep it from splashing/dripping over/on you. It will remove everything that's not supposed to be there and won't harm fibreglass nor gelcoat
. It's sold everywhere, even at the WM.
We use a soft brush (deck-brush) on telescoping handle and a big bucket. Two persons are best: 1st applies the product and the second follows with the waterhose to rinse it off and check results (when the hull
is wet after the acid is washed away, it gives an idea on how it will be after all the polishing & waxing that is to follow). You will see the hull
turning clean within a couple of minutes.
Note: it will remove any&all wax so you MUST polish & wax after using this. It isn't a replacement for soap. We also use it to remove rust stains from deck/hull.