That's the same stuff that Ford came out with about 20 years ago and nobody else had it. It was the Ford grey sealer. They used it on everything back then from valve covers to oil pans and everything in between. I have done engine jobs where I removed ALL the oil pan bolts and had to drive a long prybar under the oil pan rail to pry the pan off. It didn't need bolts! lol
man I used this stuff on my 440 intake just around the ports of the metal valley pan and I thought I was going to bust the intake trying to take it off. I hope I don't have to take the valve covers off because I might have to buy new ones lol