QUOTE="ezrider, post: 423356, member: 26100"]
Interesting. Wonder if you can coat a Fel-Pro material with Permatex ?[/QUOTE]
Why would you want to? What is the purpose?
I don't like RTV (Room Temperature Vulcanizing) Silicone sealers.
Too slippery when wet, too thick when dry. Not resistant to fuel or oil.
Extrudes wads that block ports and pumps. Doesn't stick particularly well.
It will fill gaps and flexes to a small degree.
I use ThreeBond or Yamabond non-hardening sealer on very smooth gasketless surfaces.
I use contact cement or spray on adhesive to hold gaskets in place during assembly.
I use high temperature grease or nickle anti-seize to keep some gaskets (like exhaust) from sticking.
Normally I don't use any sealer at all when I have working gaskets.
A gasket is a seal between two surfaces, to seal in fluids or gasses, at different temperatures and pressures.
The higher the pressures, the tougher the gasket has to be. Light clamping and low pressure can use a soft gasket.
If the gasket works, there is no need for a sealer. Sealer makes up for gasket or surface imperfections.
The wrong sealer can mess up a perfectly good gasket. Sealer usually destroys otherwise re-usable gaskets.
Sealer on teflon coated or graphite gaskets is bad. Un-needed sealer makes rebuild more difficult.
Cardboard works well for low temperatures and pressures. Thin aluminum sheet for higher temps and pressures.
One of my favourites is cardboard sandwiched between 2 thin aluminum sheets.
Butre's advice works too. Headsmess uses teflon tape as a headgasket. It is my new favourite.
Steve