Holding it all together: The Hull/Deck joint

It was a blustery December day in 1999 and we were bashing our 1962 built sailboat to windward across the Mona Passage on our way to Puerto Rico from Samana, Dominican Republic. Waves smacked the sides of the hull and broke across the low freeboard of our bow as we motor-sailed as close to the …

Dezincification

What is Dezincification? Dezincification is a process which selectively removes zinc from an alloy, leaving behind a porous, copper-rich structure that has little mechanical strength. The bronze alloys that we use on our boats for thru-hulls, seacocks, and propellers are made up of a mixture of different metals with the primary metal being copper. For …

Galvanic corrosion can happen above the water too.

Galvanic corrosion can happen in many places aboard your vessel. Many people believe that galvanic corrosion is only a problem below the waterline. We normally use bonding systems to reduce galvanic corrosion on our below water through-hulls, and we install galvanic isolators to prevent galvanic and stray current corrosion on under water metals. But the …

Inspecting nylon through hulls

One of the common problems that we find in a marine survey, on both sailboats and powerboats, is worn nylon through hull fittings (often also abbreviated as “thru-hulls”). First, plastic fittings should only be found above the waterline, never below the water where the only through hulls we want to see should be constructed of …