After performing a resin infusion on my carbon engine cover am I left with a few holes in the surface.  Is there a repair process to fill these in ?  My thoughts are that I could mix some epoxy and hardener and simply fill in the holes and then sand/polish afterwards.  

Hi Lee

If it's bare carbon, with no in-mould coating, then you'll find it impossible to flat and polish any repair jobs up to the shine of the rest of the part. There's so little epoxy to work with that any shine is soon lost, I'm afraid.

 The only method that seems to work, if cosmetic appearance is key, is to fill the voids/pinholes with epoxy or some other priming product, flat and then spray with automotive clear coat

Others have found ways of spraying and filling in pinholes using a brush between coats, but all methods seem to require a fair bit of time and effort to do successfully

One further option is to use epoxy coating resin on the whole part, as this does respond to flatting and polishing, but it's time consuming work even on small parts, but achieving a good smooth application really helps. You might try applying with a roller, as brush marks are almost inevitable and two coats might also be necessary

I'm sure that others will chip in with their experiences too, though