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Frank, Technically my sub is not really a
concrete sub, it's a hybrid. Only the main ballast, which is for surface
transit, is made out of concrete (ferro-cement). The rest will be
steel.
Brian
Hi Brent. Your sub was built a long time ago, and I'm sure the available
paints have gotten better since then. The grey paint is probably a zinc rich
coating if it's still in good shape after all these years. I have some paint
called "zincalate" that we used all the time when I was working and it lasts
many years. I have a friend who used it on a small metal ladder for his live
aboard sail boat, and it was still good after 5 years, submerged in salt water
for long periods. It's not cheap, but works. Will you be doing your own
sand blasting? I'm not at that stage yet, but will probably rent a blaster
when the time comes. Brian from Ojai may want to get together with us
when you visit. He's building a concrete sub. Frank
D.
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