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I have been schooled! I had erred in my statement, the presure doesn't increse, the pressure differential increases. 4 psi differential can be a huge deal when you have a sudden pressure release. You are also correct in saying that the toxic elements of a paint job would outweigh the oxygen displacement from the nitrogen but why add an element if you don't have to. This is almost as funny as the guy who wanted to inject oxygen into his carb to get more power. If you can't afford a compressor you can't afford the paint and if you don't have the facility to support a compressor you probably shouldn't be painting either. Call me stupid but I don't see the point.
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