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I don't know if you are using an electric one or an air model. I have only experience with the air powered ones and they require a good deal of compressed air to work properly, they are also expensive. If you do go that route be sure to put a little oil down the air receptacle going into the gun periodically, since they use so much air there is a good bit of moisture that goes through them. Also get a bunch of spare needles and plunger. What ever air pressure the manufacturer recommends, is the air pressure to use, more is not better with regards to this application. If you are going to be using this long term, you might be better served with a small hopper sand blaster, cover more area in less time with less damage to the steel.
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