The Paint Manual - Hempel

10
Surface preparation
3. Abrading
After cleaning the surface you’re going to paint, it must be
abraded to the correct profile. This is usually called “keying” the
surface. After keying, it’s essential to remove any dust before
painting.
Dry abrading
Dry abrading is recommended for:
• removing old paint (not antifouling)
• sanding filler
• initial preparation of wood, aluminium, steel, lead
and GRP.
Dry sanding creates a lot of dust, so you should always
wear a good quality particle mask and eye protection.
Dry abrasive paper is available in various grades and
comes in sheets, disks or on a roll. To ensure even
hand abrading, wrap the paper around a cork sanding
block.
Do not dry abrade antifoulings. They must always be
wet abraded to avoid inhaling toxic dust particles.
Size paper to fit block
Wrap paper around block
Dry abade