water/vapour blasting

[yamaico]

It's contained in a sand blasting pressure vessel. You can't re-use it as you would in a bead blasting cabinet, so yes, you just point and shoot. The soda breaks down when it hits whatever you are blasting, so it couldn't be re-used regardless.

[oldfart]

Freaky, I've soda blast some of my frames outside on me lawn . As Yamaico has stated 25 kg will go a long way  ( 2 frames easily )
To answer and earlier question by "motomaniac " there is no need to spray a protective coating on after its been  "vapour blasted "

When there is a need  for clear coating over, I use outboard clear acrylic ...by K&H

[ola_martin]

What kind of soda are we talking about?

[Hoony]

What kind of soda are we talking about?

Schweppes Creamy Soda

[crs-and-rms]

and how do you make one

[PEZBerq]

Sodium bicarbonate - baking soda.

[yamaico]

I'm not sure what oldfart uses but mine is a pressure sandblaster

http://cgi.ebay.com.au/NEW-10-GALLON-HIGH-PRESSURE-SANDBLASTER-ACCESSORIES_W0QQitemZ180430313891QQcmdZViewItemQQptZAU_Air_Tools?hash=item2a027c19a3

with a soda conversion kit

http://www.eastwood.com/soda-blasting/pressure-blaster-conversion-kits/soda-blasting-retro-fit-kit.html

Very easy to assemble and get running.