Thread: Boats / Ships & Fishing

Originally Posted by JDNSW

Certainly concrete used in hulls usually has an additive to ensure low porosity, but this need not be a proprietary additive - successful concrete hulls were being built many years before these were invented - for example, 'Helsal' a successful ocean racer of the 1950-60 period, and barges dating from as far back as the eighteenth century. I think what his discussion is missing is that concrete hulls are always adequately painted, inside and out, which prevents water absorption from being a problem.

John

He quoted Caltite because it is currently regarded as THE product. And he says a significant percentage of marine concrete structures (other than boats) never receive a lick of paint. He also wondered if the cost of initial painting, repairing damage and coating failure, and regular recoating is economic given the expected life span of the structure. How long would the builder expect a concrete hull to last in service? What is the annual budget for painting?

All boats require regular painting whether ferro , glass ,timber or steel.
We painted the whole outside of the hull with tar epoxy then used silver primocon then the antifouling. It needed less maintenance than other materials and if paint was knocked off the marine worms cant eat it.
Didiman