You can apply SCHOLL Concepts S20 Black by hand or machine, although for best results we recommend the latter. By hand, apply SCHOLL Concepts S20 Black to freshly decontaminated paint using a SCHOLL Concepts Polishing Puck. Only 3-4 pea-sized drops of product are required per 12 x 12 area, and these should be worked in firmly and evenly until only an oily residue remains. This residue should then be buffed off carefully using a PB Super Buffing Towel. For best results using a dual action polisher, apply SCHOLL Concepts S20 Black to freshly decontaminated paint using either: (i) a SCHOLL Concepts Spider Cutting Pad (if heavy correction is required on hard paint types); (ii) a SCHOLL Concepts Spider Polishing Pad (if moderate correction is required on hard paint types, or heavy correction is required on intermediate paint types); (iii) a SCHOLL Concepts Spider Finishing Pad (if light correction is required on hard or intermediate paint types, or moderate correction is required on soft paint types), or; (iv) a SCHOLL Concepts SOFTouch Waffle Pad (if light correction is required on soft paint types). Only 3-4 pea-sized drops of product are required per 18 x 18 area, and these should be worked in thoroughly at 4000-5000 orbits per minute (speed 4-5 on most dual action polishers), applying moderate pressure for the first 90 seconds or so, and then progressively lighter pressure for a further 90 seconds or so, until only an oily residue remains. This residue should then be buffed off carefully using a PB Super Buffing Towel.