Indian Head gasket shellac compound?

OK. Here's the story. I have pulled many engines apart over the years and I have seen some that were sealed VERY well. There are three different types of sealants that I have come across that I am trying to figure out what they are. I *think* that Indian Head shellac was one of them.
Basically, two sealants (one brown, one red) were almost like glue. Very strong and sealed very well. Indian Head may have been one of them but I do not know what the other was. It was NOT red high-temp rtv sealant. This was a dark red substance that was like glue.

The third was a gray sealant that was more like rtv but much better. Ultra gray, maybe?

Any ideas?

Thanks,
Stan

Permatex form-a-gasket is a dark reddish-brown color and is more like the indian head stuff than rtv. You can still buy and it works great.

All the rtv tubes I have seen have been black, blue, or orange in color. No grey that I'm aware of...

I think your thinking of the Permitex Hi-Tack gasket cement that was dark red?
The Indian head is dark brown.
Not sure about the gray? Mopar and Permitex both sell a grey hi-temp RTV sealer.

The dark brown "glue like" sealer might be permatex aviation gasket sealer. Similar to red high tack but thicker and more glue like.

The grey stuff is probably "Right Stuff" witch is made by I think permatex. The dealers sell similar if not the same stuff under there own names. Mopar sells it but I can't remember the name, Honda calls it HondaBond, yamaha calls it YamaBond just to name a few.

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The dark brown "glue like" sealer might be permatex aviation gasket sealer

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Great stuff for sealing, but you better not need to remove the part any time soon. Cleaning the stuff off is a

The grey stuff is probably the old Yamaha case sealer that lot's of people sell versions of now.

The red stuff may be Edelbrocks sealant