Here's a harmless alternative. On the R2 units, builders in the club use a can of that pressurized air for cleaning off your keyboard as a fire extinguisher. If you turn it upside down and spray it, a nice white steam comes out. The stuff wouldn't be safe to spray in your face, but it's fine I think to dissipate at foot level. Stick a flexible rubber tube on a couple of cans in your pocket, with the cans flipped upside down. Run tubes down your pants and into the rocket booster bodies, and then spray at will. Cheap, flashy, and no fire or safety dangers.
MM