I bought a Harbor Freight blaster years ago, mid 1980s? I finally assembled it 3 yrs. ago. and it is horrible on leaking out of the bottom edges into the shop
It came with some sticky insulation rubber strips but no mention in the instructions what they were for so I will now take it apart and install them and hope that fixes it
I had a real old Craftsman brand siphon type blaster that was a total loss system that had to be used outside and spread sand all over where you were working making a mess, I didn't use it very much due to that issue .
My message is buy a good brand first and not regret it later