Augmenting Gasket Integrity with RTV Sealant

Do not use this method for headgaskets. It is suitable for general use.

1.Whenever possible, use a conventional "paper" gasket, rather than
attempting to form a gasket in place with only RTV.
2. Four surfaces need to be wetted: Two metal surfaces and both sides of
the paper gasket.
3.Obtain a rubber printer's roller from a graphic arts supply house or good
photographic supply house. Photographers use a roller for ferrotyping.
4. Where space permits, dab RTV on metal surfaces at convenient intervals
and use roller to distribute RTV as a film, wetting the metal. If space is
restrained, spread a thin film with the fingers.
4. Dab RTV on gasket and use roller to distribute RTV, wetting the gasket
on both sides. Use newspaper under gasket.
5. Clean roller as soon as possible, using denatured alcohol or whatever
else will cut it.
6. Assemble gasket and parts to be sealed and bolt down. Very little RTV
will be excruded, which is desirable.

The above method will perfect a seal that will last. It is good for oil
and water resistance, but not recommended for gasoline. Please remember
all four surfaces need to be wetted 100% or air bubbles and/or skips will
defeat a perfect seal.

Blue or Red RTV is generally used, however, where there is no concern
needed to be taken for O2 sensors, GE 100% Silicone (clear) available in
large tubes for caulking guns is acceptable and despite its off-label use
described here, has been found entirely suitable for automotive use.

Use fresh materials as Blue or Red RTV will expire and won't cure! GE 100%
is date marked and will usually cure well past its expiration.

 

I hope I never have to see a car you've worked on.
Larry