Would try this on your suppressor?

Great Stuff Gap Filler Sure, you are totally fucked after it expands and dries… but when you have a job to get done and don’t want any noise complaints… You gotta do what you gotta do

Just use Vaseline, lasts longer. But yeah using shaving cream or jelly does reduce/eliminate first round pop.

It's called suppressor foam, and it's the only way to make an action Hollywood quite. Its not new, and its effective for 5-10 rounds.

What is he spraying in there?

This has been around for longer than I have been alive.

Don't do this on recoil operated handguns though. You'll just add more stress on the mechanism to the already large stress caused by the mass of the suppressor. More mass is more bad.

M16 grease

This is why there is lots of documented info ref running suppressors wet vs dry

Wire pulling foam lubricant.

The what technique?

if someones using suppressor foam, theyre on a mission, and not one that needs a lot of ammo

I use shaving cream at 99 cents a bottle but you can do what you want my dude.

Ultrasound gel or wire pull for the win.

wet cans look effective.