The coating or epoxy?
Yes to both, if I remember to coat it. Tony Bischoff turned me on to the A-788 years ago and Shade Spier and his customers have some experience with A-788 being coated and having a long life, I think it's more to protect from ethanol based fuels but so far I have not found any bad info on it, this seems to be the products most if not all head guys are using successfully.