On the Accura, a single layer of pink teflon tape (Oatey brand) over the threads with a dab of Amsoil Food Grade grease over the tape at the forward threads. I haven't wrapped over the nose of the plug yet as SL does and so far the blowback (except for Swiss pushing 497 grain conicals) has been negligible. Slick50 ONE grease will do the job also (Wal-Mart).
Clean it after every shooting session or at least every few days when hunting.