I found a way to keep shaving foam thick and luscious long-term. Make a thick Natrosol gunge and add the slime to the foam whilst the Natrosol is still thickening. Storing the foam/slime in sealed containers also helps! I've been using the same 45-50 gallons for two weeks now, and it's still Thicc. I have enough to make another 30 gallons on top of the 50 I already made. Foam bath for two anyone?