If you can lower the pressure at the gun, you may can get away with what you have for a short while. I think most shoot at 90PSI at the gun? A 2-stage, 80 gallon would be the minimum if you plan to do a lot of blasting. The more the compressor runs the more heat builds up in the air lines and may cause trouble with your blasting media. If it's only for a few projects maybe you can get away with it. If you are planning on doing a lot of blasting you will need to upgrade.
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