This is just my opinion, but although you might do okay by hand, a spinner spreads/distributes the polish (or whatever) more evenly, as well as the ability to use it more sparingly.
The original sample of Snake Oil (1 oz., I think) has polished 4 balls for me so far, maybe not quite a 5th, but we'll see. I used vitually a nickel sized drop on each side of the ball, then buffed it out all over. The balls look nice, but more importantly, perform better, too, in my opinion. Too much polish applied by hand can clog the pores if you're not careful.
Jeff (charlest) is very skilled at what he does by hand after years of trial and practice. Most new guys tend to make more mess and waste, at first, without using a spinner. Glad to hear that you're going to get a spinner soon.
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Lane Carter, Strike Zone Pro Shops - Salt Lake City, Utah
Brunswick Amateur Staff