The only other way is to rent and undustrial air compressor and media tank, but still runs around $200 a day for the diesel compressor and the sand blaster tank, and you still have the media to buy and the fuel, But if your are going to do a complete chassis it might be a cheaper way to go or if you have a friend in the construction business they might know where you can get a loan of the jack hammer type tag along compressor, as they work really good for air volume and cheap to run, 200cfm@ 110 psi and uses around 3L of fuel per hour, cheaper than hydro.
