One thing you will find is a small hand-held wand type sandblaster works, but slow as hell. I hooked one up to my sandblaster thinking I was going to sandblast my whole engine bay. Well I could have, except it probably would have taken 80 years to do it. I did not have a pressure or supply problem, and tried using both a gritty crushed glass as well as a finer silica sand. Both worked but both took a VERY long time to do any appreciable area. I ended up changing to a wirewheel on a drill, die grinder and angle grinder. I just got fed up with how slow, messy and uncomfortable blasting with a small hand held wand is. I did the bulk of the area with wire wheels and just spot blasted the corners/grooves I could not get at with the wire wheels.