by Ray Hill
Coated abrasives. All boat-builders call on them. Knowing which type and grade of abrasive to use, and how to use it, can spell the difference between a finished job that looks rough and amateurish, or one that’s super smooth and professional. A coated abrasive, regardless of its shape (disk, sheet, drum), is a single layer of abrasive grain bonded to a flexible backing on which an adhesive layer, the “make coat,” has been deposited. Before it dries, the abrasive grain is implanted in the adhesive; then a second adhesive layer, the “size coat,” is deposited over the abrasive grain to further anchor it to the backing.
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