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Canal Boat - - This Month -

To blast or not; CO wor­ries; a pump that won’t pump; slip­ping Lis­ter; com­post­ing loos

Q

I am hav­ing a new boat built. Should I have the hull shot-blasted be­fore ap­ply­ing two-pack epoxy black­ing? BILLY BOYLE

A

TONY REPLIES… It de­pends on ex­actly what two-pack epoxy black­ing the builder will be us­ing (so check the man­u­fac­turer’s in­struc­tions) and what steel the hull builder used. Most steel used in UK boat construction is hot rolled, cre­at­ing a film of ‘mill scale’ on the sur­face. When wa­ter gets un­der mill scale and rust­ing starts, the mill scale falls off to­gether with the hull black­ing, so blasting is usu­ally rec­om­mended to re­move the scale.

How­ever, you can get steel that’s been treated to re­move the scale be­fore de­liv­ery, in which case, if there was no rust and any preservative oil was re­moved, blasting might not be needed.

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