I bought an inexpensive siphon feed sandblaster from Sears. I sand-blasted the back of my house with it. I'm sure it will work for your frame. Blasting sand comes in different grits. I called around and found a place that sells sand-blasting sand. I bought several 50lb bags from a local supplier. If you have to fight thru heavy scale or rubberized undercoating, go with the heaviest grit. Others have already told you about the mess and you are obviously aware of protecting your face/eyes. Regardless of what kind of blaster you get, purchase extra nozzles, they wear out.