Can i use this to sandblast paint off a truck without harming the metal

My tractor supply throws all the blast media in all the spaces for fine medium and coarse There is no labels on the bag so you dont know what grade you are getting. Using it strait from the bag wont work unless you have a serious heavy duty sandblaster. There are to many big pieces that will clog the average gun let alone the crap guns they sell there. You will have to take a window screen and filter out all the big stuff and you will be left with perfect size pieces for your gun but half the amount, it will work that way and if it doesnt you have a poor setup. Would I buy it again, HELL NO. Buy some quality media thats filtered perfect for you gun and pressure, glass beads will flow a lot smoother put more stuff on the part and be quicker. Tractor supply needs to get this crap off the floor along with there crap blast cabinets and guns!