Sand blasting takes a LOT of air.
The common 2 to 5 hp air compressor does not have enough volume of air to keep up with most sand blast guns of the siphon type.
There are pressure sand blasters that have a pressurised tank filled with sand that use less air. It is controlled by a "deadman" type valve that uncovers the nozzle from the outside using a rubber block.
Sand blasting will bend and warp panels if they are thin or flat or even pretty strong panels if a lot of pressure is used.
Plastic media and soda are used but get duller each time they go through the gun.
You need some way to contain the sand, or media, to re use it, and it will have paint with lead in it so it's a hazard and probably regulated by your local health agency.
So if you contaminate soil with it you could have an expensive clean up problem.
I know for having media blasting done here in California, it only pays if you have a lot of paint layers on the car to remove, or corrosion problems. Otherwise for plain flat panels just get some paint stripper and scrape the paint off.
Also, the media get's into corners and it will be shaking out of crevices for years to come.
Check my web page for First Gen Camaro suspension info:
David's Motorsports page
First Gen Suspension Page
67 RS 327
69 Camaro Vintage Racer
65 Lola T-70 Can Am Vintage Racer
[This message has been edited by davidpozzi (edited 12-15-2000).]