[Moppie]

Iv used on an old engine that just need to last a few more hundred kms before it was rebuilt.
It slowed some leaks in old paper and cork gaskets.
But would have been a bitch clean up if the block and head wen't hot dipped.

I also know someone who put some in an old DOHC Turbo Mazda Familia (circa 1990) and it worked really well. For about a week, then the stuff set in one of the oil galleries in the block. You can guess what happened after that.