Separate abrasive particle size from surface roughness so a micron value on a drawing does not become an incorrect sandpaper order.
Keep the P prefix when a process specifies it, and do not classify an unprefixed product as CAMI without manufacturer evidence.
Choose a structured abrasive as part of a matched tool stack, then commission the disc, pad, interface, machine, and operating mode together.
Diagnose dark-finish swirls before sanding, then select a structured abrasive by incoming scratch, compatible hardware, and the proven polish step.
Select a feather or nib file by contact geometry, grip, coating compatibility, and the scratch it hands to the next repair stage.
Treat a mismatched veneer patch and its field as separate grain lanes, staggering their starting grits before a light shared endpoint.
Choose a pre-etch grit ceiling from the billet maker’s process, then verify scratch removal and pattern clarity on a same-steel coupon.
Use humidity to judge conditioning and sanding readiness, while choosing bathroom-vanity grit from the actual substrate, cured layer, and next coating.
Read fiber direction separately from ray figure, pace each grit by an inspection exit test, and stop quartersawn oak at the endpoint required by the finish.