Sandpaper and hull pads are abrasive materials used for smoothing and preparing the surfaces of boat hulls, whether made of wood, fiberglass, or metal. Here's an overview:

🛠️ Types of Sandpaper for Boat Hulls

• Dry and water-based abrasives (wet/dry):
  Useful for sanding between coats of paint or gelcoat.
• Silicon carbide or aluminum oxide paper:
  Carbide: sharper, ideal for hard surfaces;
  Oxide: more durable, suitable for prolonged sanding.
• Abrasive discs on Velcro or canvas backing:
  For random orbital sanders.
  Used on large surfaces (underwater and abovewater).

🧽 Types of Abrasive Pads

• Hand-held abrasive pads (Scotch-Brite type):
  Used to matt or finish curved surfaces.
  Useful for surfaces where sandpaper tears easily.
• Medium or fine grit pads (green, gray, red):
  Color often indicates grain: red -> medium grain; gray/white -> very fine; green -> aggressive

⚓ Typical uses in the nautical field

1. Removal of old paint or antifouling
2. Preparation for primer, enamel or gelcoat
3. Finish between layers for a smooth surface
4. Sanding between coats of epoxy resin