well this is a link to what i've used for the last 15 years never had any trouble from it.just put lite coat of this on and let set a few minutes stuff works great that built a truck and made his headers lets just say they were'nt flat i said those will never seal he used this stuff and they did'nt leak but this is just what i use good luck john
http://www.permatex.com/products/aut...sket_Maker.htm

 

guess i forgot type in some words there lol
and thats with no header gaskets

 

thanx again for the info guys. i always read all the posts then a little research and a purchase. i am sure to have more questions in the future,thanx in advance.