I never use copper spray and I never reuse gaskets, why take the chance? new gaskets are cheap, for 75 bucks per head gasket I wouldn't even bother to chance it, I throw them on the scrap pile, and I had my heads off 4 time last summer
$75 can be quite a lot when changing multiple times a year. I have, but don't suggest, reusing head gaskets. Most use I have gotten was 3 time head off and on the engine with the same head gasket.