When I set up the room for my sump used the green aquaboard, primed then top coat with CIL Dulux Kitchen and Bath Satin (very slight grey tint).
On the wall behind the sump near when the skimmer and returns discharge, I know I get a little salt on the wall. Just checked and see in a area the size of my palm the paint there is little rough, not bubbling but feels and looks a slightly bumpy. This is after close to a year and imagine only since it's continuesly exposed. Other areas where I know I've splashed water and wiped, no problems with marks and smooth.
Guess I'll get going on that cover.
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