thanks for the replies I think the paint option is the one I was more thinking of what casamolino has used. I was actually thinking of a textured stone chip same sort of idea or hammerite spray.just waiting on some release wax to make a mould off it before I fit it then I can use it on the next build too after I have put so much work into it
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just primered it to see what it looks like in paint, will drop the screen vents into it after the moulding process omne less thinking for it to stick to