Wood and MDF respond to abrasives differently from metal — the surface finish before a topcoat application is the product, not just a step toward it. Sharp premium aluminium oxide grain on a controlled F-weight paper backing cuts cleanly without burning the surface, and the semi-open coat resists the resin loading that kills standard paper discs on MDF and furniture components within minutes. Hook & Loop and PSA compatible for random orbital sander use on wood, MDF, and general surface preparation.