Just bought a cabinet from Harbor Freight (speaking of things made in China ). Now I need a blaster setup. Are the Harbor Freight ones acceptable? I just need something for occasional blasting. I assume the pressurized ones are better? 20 lb vs 40 lb? The 40 lb is on sale but it's pretty big to have to store compared to the 20 lb. Also, can you use all the different types of blasting media interchangeably(abrasive, glass bead, walnut shells, soda, etc) or are they made for a certain type? What is the best blasting media to use on a rusty ralley II? Any and all advice is welcome.