WSI Boat Bottom Hull Cleaner, 1 Gallon Type 3 discs these Mirka blocks are soft

these Mirka blocks are soft on one side and firm on the other

At least 95% filter efficient

Dramatically reduced environmental impact

Do not use with two‑part systems

Machine and hand sanding with hook & loop backing pads and hand blocks

WSI Boat Bottom Hull Cleaner, 1 Gallon Type 3 discs these Mirka blocks are softNote: This item can only ship via ground service, it cannot ship via air express service. Please select a ground or discount shipping option at checkout. Product Overview: Redihan's WSI Boat Bottom Hull Cleaner is a heavy duty boat bottom cleaner that instantly removes exhaust, rust and stains caused by algae from fiberglass gel coat boat hulls on contact. This product is much safer and easier to use than traditional acid based hull and boat bottom