Form a gasket works great on paper gaskets and mating surfaces as previously mentioned.
It stinks and you'll find it all over the place after you've used it.
You generally have to scrape surfaces to remove the gaskets down the track.
I have used it before on
oil pans but you have to be really careful with torquing down with cork gaskets coated with this stuff as it tends to help the gasket squeegee out...
To be honest there are probably more suitable products around these days !!
In the 80s, a bottle of Form-a-gasket was a 'do it all' in your Arsenal of seal it products for us..
Cheers