First off, the ones I've had/got, are very good and provide excellent protection. I don't know about the pre-treated foam but I routinely treat all my hard cases and no complaints so far. I do not store any firearms in them, only transport or short term storage. .....How good are the flambeau rifle cases ?
I spray the foam "lightly" with Silicone spray lube. I got a good deal on a case of Gunk Silicone spray cans and that is when I am currently using. I routinely treat all my other cases with this. When I work on somebody else's guns, I treat their case as well. ...What do you treat your case with ?