Glossary Term
Propeller Polishing
Propeller polishing is the cleaning and surface finishing of an uncoated propeller to remove slime, light marine growth, oxidation, and surface roughness that reduce efficiency. In yacht maintenance, it is usually carried out underwater by divers or with specialist in-water cleaning equipment, though it may also be done during docking. The aim is to restore a smooth working surface without altering the propeller’s designed geometry.
IMO biofouling guidance states that regular polishing of uncoated propellers helps maintain operational efficiency and minimizes macrofouling accumulation. The same guidance treats propellers as niche areas that may require special cleaning equipment and procedures, and recommends that sea chests and similar areas be assessed when divers are already in the water for routine propeller polishing.
For a superyacht, the value of polishing is tied to fuel burn, vibration behaviour, and speed consistency. The job still needs restraint. Excessive abrasion, loss of edge definition, or uncontrolled cleaning around nearby seals and appendages can create new problems while solving the old one. Propeller polishing works best as part of a planned underwater inspection or test and survey support scope with clear acceptance criteria on surface condition and fouling status.