Y-10 is a stain absorbent gel, which is easy to apply, requires no rubbing and is non-abrasive so it won’t damage the hull . It rapidly removes yellow/brown waterline and transom stains on white or light coloured fibreglass sailboats and powerboats.
To use brush a thin coating of Y-10 over the stain wait 10 minutes while a mild chemical reaction causes the stains to vanish, then wash it off. The gel spreads easily and adheres to vertical and overhead surfaces. Y-10 is also effective at removing rust stains around engine exhaust ports and other fittings.