Originally posted by cody1234
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And be aware that even a fairly small blaster can require quite a bit of air. So make sure you have a compressor that's up to the task.
Blasting small areas on body panels with a small, relatively low pressure blaster usually isn't a big concern. But there is the possibility of warping / distorting body panels when blasting (it's like hitting the panels with thousands of little tiny hammers that can stretch / warp the metal). It's especially an issue with larger, higher pressure equipment and on relatively large/flat areas like roofs, hoods, middle of doors, etc.
The under-side of a vehicle is probably one of the messiest places to blast since you can't always use a containment system due to all the little nooks & crannies. And as I mentioned earlier, the little blasters with gravity feed hoppers won't work for this type of job with the nozzle pointed upward. So you'd want to look for a small siphon feed blaster instead.
Hollow, boxed in areas of frames & under-body supports are especially hard to deal with. When rust gets into places like that you don't have a lot of choices. Short of replacement, the only other option (if possible) would be to cut open a side / section for access, blast & paint the inside, weld the section back on, and spray some rust proofing in through drain holes, etc.
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