Sanding through all the grits to 220 grit won’t improve the finish one bit. But with closed-grained woods like maple or birch, don’t skip any grit steps, and go all the way to 220 grit. A clean work ...

He also notes that polyurethane rollers can be engineered to deliver extreme accuracy in both wet and dry operations, such as machined tolerances to ±0.004 in. (±0.10 mm).