What it takes depends on how bad the chassis is to begin with. I recently blasted a 1968 chassis in 3 hours and 4 100lb bags of sand at $6.25 a bag. Just a few weeks ago I did my 1952 half ton panel chassis and it took me close to 6 hours and 6or7 100lb bags but my chassis was BAD.
Last summer I had a 1937 chassis blasted that wasn't to bad and it cost me $150.
Folks around here won't "do a chassis" at a flat fee because of what I mentioned above. They charge by the hour which includes the sand. Current rate is $100 an hour for sand and $125, or it may have been $150, per hour for soda blasting.
If you have only ONE chassis to do then pay someone else and you'll be better off. I bought the pressurized system and did mine myself. I may have save money in the end since I still have a practically new blaster set up but as hot as it was in the summer I wish I had stayed home and let someone else do it as i will probably not blast another and end up "loaning" my blaster out and letting someone else get the use out of it.
Hope this helps you make the right decision for YOU


1937 Chevy Pickup
In the Gallery
1952 Chevy Panel
In the Gallery
More photos
1950 Chevy Coupe
Pictures!

I'd rather walk and carry a Chevy hub cap than ride in a Ferd.
I can explain it to you, but I can't understand it for you smile