WEB Q&As

THE SCALE TWO-PACK PREP

Canal Boat - - Back Cabin - BILLYBOYLE, CB

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.

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