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My sailboat has a lot of scum and moss built up along the waterline and on the sugar scoop transom. I tried to remove it with the rough scrubbing side of those green scouring pad but that was useless. If you look closely at the photo of the gunk on the waterline you will see that there's a blue...
I was wondering if anyone has applied Monstaliner over a polyester gel coat without applying primer first? If so, how long ago did you do this and how well is it holding up?
Thanks