I hear ya on a hot, filthy friggen job !! I blasted the entire underside of my '66 Chevelle in my driveway with a little 100# pot blaster. I had 300# of sand and knew it wouldn't be enough, so put the car on a tarp. Good thing I did. Over the next 13 HOURS, I swept up that sand, screened it and ran it thru the pot so many times I lost count. As you say, the overalls and helmet get really hot and all I had was a few bottles of water and a couple cheese sticks all day. The sun was going down at 9pm when I finally pulled the car back in the shop and cleaned up. NEVER again. I'll take it somewhere and pay for the job.
Rolled it out the next day to clean and prime.
