fwiw,
I really like dealing with rust ..
and all I ever use is a power wire brush ..like a wire brush on a Makita
disc grinder.
Takes it  to bare metal in seconds.

I'm thinking you might be wanting to get 'down in' crevices more ..
and for that a blasting media would be better I'd think.

did you google or wik-it ?  re 'soda blasting'.

I never use a grinder on rust though, never anywhere.
that's for removing material..
we just want to remove the soft rust and get to whatever real metal is left
under it.
and grinding leaves grinding marks of course.
a power wire brush barely does.

and ..for crevices ..once as clean as I can get them, I treat the metal down
inside the crivice with Rust Converter....the kind that says 'turns rust to
primered metal.'

scott
www.turbovans.com

----- Original Message -----
From: "Jim Felder" <jim.felder@GMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Wednesday, September 15, 2010 1:16 PM
Subject: Soda blasting question

>I want to finally address some bubbly paint and light rust where a
> body panel was welded in place way back before I got the westy. The
> rust has not gotten any worse in the last seven years, but I want to
> finally get around to taking care of it.
>
> I could take care of it with an angle grinder. I thought about sending
> it out to have it sandblasted. The other day I saw a soda blaster. Do
> the actually remove paint (seems like a great way to clean up a part,
> but will it take out rust?)?
>
> If anyone has any experience with any of these methods on Vanagon
> seams, I'd like to know.
>
> Jim