Copper based bottom paint on Bronze

[Hermit Scott]

This topic was brought up not too long ago. While I was epoxying the around my through hulls I thought about if I should paint them with bottom paint? After all they are bronze, and won't bottom paint do the same thing to them that it does to bronze props?
Is this a cause of corrsion that is blamed on something else like stray current? If you have bronze through hulls and bronze seacocks they are pretty chemically stable but the added copper based bottom paint could be an overlooked cause of corrosion.

What do I do now? I am not painting the prop or prop shaft; should I not paint the through hulls also? I will have a lot of scrubbing to do all over the bottom to keep up with the marine growth down here. I was walking the dock today and a sailboat had a rib inflatable hauled up hanging from a halyard and the bottom had 3" or 4" of growth! I thought about going back and getting my camera, but laziness overtook me.

Unbelieveably I have owned my boat for 6 months or so, and today was the first day I saw a sailboat actually sailing up close. One went by the pier on a beam reach just using the main, then whipped around a 180 degree and sailed back the other way.

 

[RichH]

Copper based paint is not a problem for thruhulls.
However, for large surface area bronze members such as large struts, large rudder pintles, cutless bearing housings, etc. any applied copper based paint will usually be ineffective to those parts versus BARNACLES and other attaching shellfish - if there is a large bronze item under the bottom paint the barnacles dont seem to care ... they attach.