1mm steel cutting disc in an angle grinder, gives a perfect cut. You don't need to seal it. I make motorcade seats out of GRP and find that the cut edge of GRP just soaks up the paint, so much so that by the time you have a decent amount of paint on the edge the rest of the panel has so much paint on it that it looks like the surface of the moon.
I simply go over the cut with a Black wide chisel tip pen at 45 degrees, takes the "whiteness" away from the cut GRP.
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