I know they always say to not sandblast the sheetmetal, BUT I spent an entire day with a 3m wheels in the air dirll and got about 1/4 of my bed on my 50 F1 pu. I said the heck with this and brought out the pressure blaster and finished the entire bed in a couple of hours and epoxy primed ready for body work. I was careful not to stay in one place longer then necessary to get paint off and to turn rusty areas greyish. Sounds like the fellow above is using the blaster wrong my 90# tank goes a long way and am using Harbor freight nossle with ceramic tip. Yoy must remember that the old ford is 19 guage and thicker, would not think of doing the same on some of the newer vehicle with 20-22 guage material. Ed ke6bnl