valve covers that won't leak - ??

I just used that that thick *** black one 4spragtop posted. Its like an expanded foam, very light for what it looks like it would weigh. I also likes the old MP gasket kit ones that were gray and were rubber over a metal frame. cant remember if they had the torque limiters but I never had a leak on a straight cover with those. I dont like cork as it seems to stick when it gets burned by the up and over headers of an LA.