I've used the same for the water pump, Tbird spacer, and thermostat housing.

I use the orange RTV in   where needed (pan, front cover, thermostat housing, etc) and it has always worked out very well.  The engines I had rebuilt (short blocks) were done by outsiders and have no idea what they used/did but, knock on wood, I don't have any rear main problems.  The information  about Right Stuff is interesting.

54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ

I just completed the rear main seal in 55 292.  I bought a kit from Prestige Thunderbird.  They supply a new aluminum block the two neoprene seals and a tube of Permatex Grey.  The Permatex is used in place of the OEM rubber/metal staked seals.  It worked very well.   My biggest challenge was getting the rope seal out.   Send me your email if you want to see a copy of the instructions 

Let us know how it works out. 

When I inherited my 55 Tbird, anything that held oil or ATF leaked. I hope to do better. 

Going to use the Black RTV on Gaskets and the Black "Right Stuff" on the Rear main in place of Side Seals. 

  

Question answered. Thank You. I am in no hurry to put back in service so Black it is. Also going to use in place of side Seals.

  

I use the Ultra Black RTV as it tends to be more pliable when it dries than the ‘Grey’ series.  The Black does require longer drying times and overnight works for this.  If time is of the essence, then the grey dries much more quickly.

Lorena, Texas (South of Waco)

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Well  I am in the process of re-building mine. Using "Best" Gasket Set which includes rear Main Seal. I will be using "The Right Stuff" again. I like the Odds much better using the Sealant rather than Side Seals. The Rear Main Seals was a problem right from the Time these Cars were new. Not a great design along with the Original Tin Valley Cover. I have a New Mummert  cast Cover to go on mine. Another potential leak fixed. 

  

I agree the rear min seal itself often takes the blame for side seal leaks.  There is constantly new advancements in sealer technology and "the right stuff"  may be the best substitute for solving the side seal issues. I have had experience with a fairly new caulk that has excellent adhesive characteristics and holds up when filling large gaps even when flexed and can be applied to somewhat wet surfaces. It is supplied in a clear tube for caulk applicators but I can't remember what it's called. So why not develop the product for the  automotive world as well? At this time, should I rebuild another y-block, I would try it.  Why not buy a tube and experiment?  

64F100 57FAIRLANE500