There will be a regulator valve on the unit and you can adjust it to do the job in hand ie light ruat/paint --just enough pressure to to the job --- heavy rust --more pressure material--- plastic light pressure--- aluminium more pressure --- steel will handle even more pressure.
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There will be a regulator valve on the unit and you can adjust it to do the job in hand ie light ruat/paint --just enough pressure to to the job --- heavy rust --more pressure material--- plastic light pressure--- aluminium more pressure --- steel will handle even more pressure.