THE SCALE TWO-PACK PREP
QI am having a new boat painted with two-pack epoxy. Should the hull be shot-blasted first? I have been advised it doesn’t need it as it adheres better to the surface if not blasted. from the website
ATONY REPLIES... If the manufacturer’s instructions say the steel should be blasted in some way (probably quoting a BS or ISO number defining the preparation) that trumps anything anyone else may claim. Much UK steel has a film of mill scale on the surface, and when water gets underneath and starts rusting, the scale falls off with the blacking. Some form of blasting is usually recommended to remove the scale.