Sun Odyssey 35 (2002) pedestal base corrosion

[dbrandt6]

Thank you in advance for any help. The white paint on our pedestal base was bubbling up and chipping off, showing a white powder beneath the paint. I am sure this was the original finish. Two years ago I removed all the paint from the base, cleaned it thoroughly, applied a good quality metal primer and then applied two coats of a good oil base enamel finish paint. I noticed within a month, right around the four bolts that hold the pedestal down, some bubbling was already starting. To date the base looks as bad as it did when i refinished it. I'm pretty sure the bolts are stainless steel whereas the base looks to be aluminum? Is this galvanic related? If so, what type of metal is the base made of so that I can get new bolts to match?

[Zanshin]

I think that the base is indeed aluminum and the bolts steel, so you would need to ensure that you use a PTFE type isolator, the best that I know of is TefGel - but you'd need to get rid of the paint first, remove the bolts, use TefGel, rebed the bolts and repaint I had the same issues on my 43DS base and have to admit that I sold the boat before fixing that problem.

[Full Circle]

Its actually galvanic corrosion, same as your anodes!

You can rightly use TefGel, but I use Duralac, an aircraft corrosion inhibitor. It also helps on threads going into differential metals.

www.llewellyn-ryland.co.uk/duralac.html