Join Date: Aug 2013
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Re: Blotches on deck - can you identify
You had the boat waxed? Deck and wax doesn't go well together:
1) difficult to clean as the anti-slip on the deck works against cleaning. Not to speak about removing old oxide and even the surface with rubbing etc, this is just not possible if one wants the anti-slip to remain.
=> deck surface will not be really cleaned.
2) wax makes the surface more slippery (there are special anti-slip waxes, but in my experience they are not good in any respect).
3) decks are usually horisontal. Moisture and dirt doesn't just drip away, but stays longer, some of it forever it seems.
The blotches you see can be any kind of dirt that was not really removed before waxing, combined with water / moisture. Can also mainly be just increased moisture in the wax. Disappears when the surface has dried. Comes back when new water is applied.
If you can't live with it (I would) then you have to completely remove the wax. Then you have to decide if you want new wax or not.
An alterntive solution is to paint the deck. Up-side is that there is no wax, no such issues - and you get a fresh deck in the color you prefer. Downside is that the deck need to be repainted now and then.