Big thing is to not be like most people, me included, mount it and forget it or ever check it beyond walking by it. I have had two, one in the house and one in the garage, that the gauge was showing proper pressure but when tried to use them nothing came out. The powder had apparently packed or solidified to the point nothing would come out. Don't know if it helps but I now at least try to flip em', shake em' a little every now and again.
