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Some yards wont let you spray (use) polyu if it contains isocyanates....check before you buy. On a steel boat, it is worth thinking about your "touch up system" The inveitable knocks will create rust bleeds that will beg you to paint them. Not because your boat is going to fall apart, it just dosnt look good. Multy product finishes mean that you will have to have the same to touch up, and may have to sand and feather back to bare metal to build from epoxy back to poly. (you dont want top coat poly on bare steel).
Sieved garnet works well as an anti slip additive, it is used as a sand blasting media. Sprinkle on liberly to wet, masked areas, gebtly broom off when dry and recoat over the top.
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