Actually you should not need any sealant at all if the plug bores are in good condition. I used to use sealant till I had a couple of plugs blow out in a circle track application. Racers get angry when they have to get off the track due to scorched feet and over heated motor. 2 separate incidents and I started using Permatex Sleeve Retainer--That was over 10 years ago. Many many frost plugs and cam plugs later not one leak and not one blow out. I think I'll just keep doing what I'm doing. J.Rob