I took one of my freeze plugs out the today and now im gunna put it back in but there is a like a gasket or a teflon type materal on it what is it? where can i get it? i was gunna just use teflon on it but i dont think it will stand up to the head of the motors and i dont know what to use someone please help

 

rtv???

 

well what was on there before was white

 

Ive always used RTV

 

https://ls1tech.com/forums/generation-iii-internal-engine/556212-ls1-engine-frezze-plug.html