[abl1111]

I am going to be re-gelcoating my i/o engine cover ( it has standard SC non skid on it too ).

I am going to sand the 1/2" smooth gelcoat by hand w/ 120 - 220 grit, or so. Then I am going to take a narrow wire brush - you know the type, it's like 1" wide and 10" long w/ a wooden handle, and I'm going to lightly roughen up the non-skid.

Then, I'm going to spray the whole thing ( gelcoat ) - I do not need or want new non-skid here - it's ggod enough, but if I did, I would tape off the different sections and spray twice - adding grit where wanted.

Note: I once painted gelcoat on a non-skid floor on a sailboat and a lot of the grit 'sunk' to the bottom of the layup. So, be sure to mix the application can w/ the grit very well and often - and do not lay it on too thick or the heavier grit will sink and not be at the surface of your application - giving you less of a non-skid effect.