My 74 is down to a shell with quarter panels removed. The only exterior metal is the roof skin, tail panel and rockers and all of those are already stripped with a sander. I want to get a blaster to strip rust & paint off the window channels, trunk gutters, jambs and other misc small nooks and crannies, nothing that I have to worry about warping. I already have a 60 gallon compressor, 11.9cfm @ 90. Not the best but not the worst I expect to take breaks for it to catch up. I was looking at Harbor Freight pressure blasters. They have 3 models, a 20lb and 40lb that have a basic ball valve nozzle and a 110 lb with a deadman valve. Not sure which to choose, anybody have any experience with these? I imagine they all work on the same principle aside from capacity but wonder if the nozzle makes a difference. I was going to use black diamond coal slag as a media. Tractor supply sells fine and medium for $10/50 lbs.