I have a cheap blast cabinet from Harbor Freight and had similar problems...I ended up drying my sand by pouring it into a box and putting it out in the sun or putting a two inch layer in the bottom of the box with a fan or a heater to blow on the sand and dry it. I also went to kiddy sand and it tends to clump less and is still pretty fine. I use to use the finer glass bead, but after switching to the Kiddy Sand I found it works better, plus its like $4-5 for a 20 or 30 pound bag as Home Depot. It works much better and cuts so much faster. That came from as a suggestion of another forum member and I will never switch back.
I purchased a higher quality blast gun...well at least I think its a better gun...but I made sure that it has a larger inlet where the sand is sucked in. below is the gun I have. Its not perfect but way better than what came with the cabinet.
Often my gun clogs...to unclog I also put my finger over the end of the gun and blast air, It helps.
I've seen what other forum members have for dryers....the good ones are $300-500...they have a heater type system that gets rid of all the moisture. Seems like the link you posted is a system you could blast a whole car with...way better than the garbage I have. Maybe put your blast media in the oven to dry out the moisture before putting it the tank? I agree there has to be a better way. [FLASH_VIDEO]
Good luck I know how frustrating it can be.
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