Chuck,
On-site blasting does have its own special requirements because of all the dust that is created.
I have seen blasting done in an office environment where they built a tent enclosure to contain most of the dust.
If you are serious about this, I would recommend a system from Glastar made specifically for dust-free, on-site sandblasting. The blaster, pictured in the attachment, uses a high volume vacuum return to recapture the dust and abrasive and to recycle the usable abrasive through the blaster continuously.
The blasting section of the Glastar unit looks like a brush attachment that you would find on a vacuum. The abrasive media is released and reclaimed within the brush. I would argue that it probably is not 100% dust-free.
This Glastar blaster is a siphon system, so it requires a substantial amount of air to operate continuously for long periods of time. If your existing compressor is not adequate, or if it is not portable, renting a larger compressor could be a viable, low-cost option for you to get into on-site blasting.
Many people doing on-site blasting use 2 hp, 110v compressors even though these compressors do not provide enough air to blast for long periods of time. They simply modify their blasting technique to alternate short periods of cutting out the resist with short periods of blasting, instead of doing all the cutting first and then all of the blasting. Some people use two 2 hp compressors to provide a longer period of blasting time before running out of air.
Some of the above information has been taken verbatim from the Glastar website.
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