Use 1200 when visible 1000-grit marks or minor texture still need correction; use 1500 when the surface is already uniform and the next operation is a finer abrasive...
Rehearse a floor-finishing schedule on a representative mixed-species sample before machines cross a contrasting border or inlay.
Test a proposed coating system on the actual existing factory finish with representative preparation, rather than accepting dullness or a next-day scratch as proof.
Compare named finish instructions: oak and maple preparation for General Finishes Dye Stain, plus the final-grit limit for Rubio Oil Plus 2C.
Diagnose a failed layered edge bond before removing more material from the surrounding leather.
Separate bowl scratches from rim refinement and stop removing healthy rim material to chase a local defect.
Validate a replacement abrasive on a controlled sample rather than treating micron and grit labels as performance guarantees.
Distinguish uneven contact, compressed pencil marks and contamination before chasing a mark through the wood.
Check resin-specific washing, drying, and post-curing before sanding a printed part. Preserve dimensions and avoid universal bake recipes.