Prepare Paint-Grade Beech Without Blotchy Primer Absorption: a controlled method with test areas, stop conditions, and dry acceptance checks.
Trace disc movement to centering, dust, heat, incompatible backing, a worn pad, or excessive speed before another disc leaves the tool.
Separate removable compound film from fresh pad haze before choosing a cleaner, finishing polish, or another abrasive step.
Decide whether broad waves come from support movement, excess material, or low areas that need rebuilding before sacrificing more surface thickness.
Separate a dull sanding patch from a lost contour, then decide whether to blend, reshape, rebuild, or replace the affected part.
Use when and where dust starts escaping to prioritize the pad, hose, collection bag, or filter instead of changing abrasive grit at random.
Separate a surface smear from lost shape, crazing, and coating damage before trying to rescue plastic that overheated during sanding.
Choose the right intervention for a local drywall knife ridge: smooth workable mud, scrape a dry bead, or sand the small remaining high without exposing tape.
Identify a deposit, possible heat damage or material loss before trying to sand a dark mark out of wood.