Does anyone have the 40lb harbor freight sand blaster they sell. I am having trouble with the one I just bought and was wondering if there were any tricks to this thing working properly. It seems as if when I get down to the end of the sand is when it starts blowing real hard and working right but before that it just blows out too much material and not alot of pressure. I wasn't able to use the nozzles they provided either as they clog immediately. Any Help?