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Old 27-07-2012, 07:01   #16
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Re: Waterline stain removal

Try Collinite 920. Works on all things, boat. Great for cleaning SS also.

Fiberglass Boat Cleaner Collinite
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Old 27-07-2012, 07:10   #17
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Re: Waterline stain removal

Could you not prevent all this scrubbing by simply raising the water line so the growth and crud ends up on bottom paint and not topsides?
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Old 27-07-2012, 07:20   #18
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Re: Waterline stain removal

Hydrochoric acid applied applied with a non metalic brush or spray, after 5 mins brush and rinse off, you must be extremely careful and wear the correct protective clothing and eye goggles, it's worth the effort and it will bring up gelcoat like new.
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