Silica the material in sand to breath that in is bad for you.You really need a respirator/hood if you get into the size blaster you would need to do the job.Sand isn't easy to clear afterwards.Try as you may,while painting the spots you couldn't blow out will allow sand to get into what your trying to finish paint.

This is a very strong knowledgeable company that has been in the business for many yrs who could best advise you.

TP Tools & Equipment