By not using the glass shield you will be blasting the inside of the glass as your beads bounce off the metal piece your cleaning.
I get my supply from WalMart, material dept, cut it to size, use 3M two side tape (found at the better office supply stores). Some days I'm sitting in front blasting almost all day.
I put the dust collector in the storage barn to get the noise level down in the shop. Works quite well this way. Some times I use a personal walk man to pass the time.
Enjoy your new toy.
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Tigerpaw65
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