this has been asked and answered before probably. i did a search and didnt find no solid answer.
which resin would you guys recomend to use for an engine cover overlay?
Vinylester or ISO Polyester
Vinylester being the first choice. Also realize you will have two different types of plastic shrinking and expanding with heat/cold each time the engine is brought up to temperature or above, and then the car sits parked.
Best idea would be to make a mold from the existing engine cover and make an entire new part. BUT… otherwise I myself would use vinylester resin for the overlay.
VE resin can take the heat better than a room temp cure epoxy.
But let’s see how the other guys answer 
I say make a mold of the part, and then make a part off that…no overlays! It’ll peel off in the drastic heat change anyway.
how about just making a cover…for the engine cover? 
i was thinking of vacuum bagging a two layer 200 grm carbon, which will be held down by the same screws as the aluminium cover… i generally make stupid parts like this, i dont mind if they’ll be thrown away eventually, just to see how they will stand the test…
at the paint shop, i found a 150C resistant clear coat too! :rolleyes: