I used to run a copper gasket on my 18rg race motor i got it from a crowd down in melbourne called ridgecrest engineering ph 0359814334 now for memory we didnt need to use any sealer on it but if re using it they do need to be heat treated to soften them back up. My advice is to give them a call as they manufacture them and they should be able to tell you what is required. Cheers NEV.