Never had a leak (1 piece plate) when sealed with Hylomar. And there is no cure time.
Is that like the stuff gm use's on the front diff case half and t case half ? There's is red though.
i don't know about the GM stuff, but what i use is a light blue. Also use it around the water holes with SCE copper head gaskets (o-ringed block). So far, there have been no leaks there either.
