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Discussion Starter · #1 ·
If not what then and what steps do I take before I paint. This is my first spring with a boat and they were not there last spring and only one little bump was there in the fall.





I did not do any digging around or anything. They look like bubbled up paint. I do know the skeg and rudder have some moisture in them. Any help appreciated.
 

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They look like rust blisters to me, in that they appear to be on metal parts of the keel, not in the glass. Even those on the rudder look like they are only over the hardware portion.
 

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It looks like rust to me. The rudder fittings seem to be steel and the bubbles appear to be only on the painted steel pieces. So, no, not fiberglass osmosis. Time to get out the old chipping hammer, wire brush, phosphoric acid, red lead paint and put on your IPod headphones; you've a bit of work in front of you.
 

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Agree with with both opinions. Still, a few seconds with a marlin spike or reasonably sharp nail will give you a more definite answer. Wear eye protection, just in case.

Lou
 

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Most likely the 'red' form of rust (ferric oxide) which when it forms has less density thus more volume than the base metal .... hence the 'push' of the paint. Capta has stated your remedy.
 

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Discussion Starter · #6 ·
Well I am a metal worker by trade so thats no biggie. So you are saying that that surface is just painted and primed metal, so just get all the paint and rust off and prime then go ahead and do the bottom paint? So is there no glass over the fitting or will I need to reglass as well? thanks for the help so far. I will dig into it over the weekend perhaps.
 

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Discussion Starter · #8 ·
anyone know how these things are attached. I thought the metal was inside the core and glassed over? That would make the job a whole lot more interesting. Or is it just sandwiched around the rudder and bolted somehow?
 

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The usual method of attachment is soft(er) metal pins inserted into 'chamfered' bore holes of the 'straps' and with the ends of the pins/rods peened-over (flattened) flush to the 'straps' with a hammer ..... similar to rivets.

When you clean up those 'straps' you should see the shadows of exactly where those pins/rods were inserted and ' peened'.
 

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Discussion Starter · #10 ·
cool, on the one pic I think I can see a horizontal line where the strap ends. no blisters above that either.
 

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On my boat your blistering would correspond to a bronze casting/machining, that forms and supports the gudgeon. It is through-bolted into the fibreglass.

Suggest getting to work with a sander and seeing what's underneath!

These pics might be of interest. (scroll down)

Solving Rudder Cracks
 

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Hard to believe that gudgeon is anything but bronze. The bronze has likely been faired over with some kind of putty that has absorbed water and is blistering. Highly unlikely it is anything more serious than poor quality fairing compound soaking up some water.

The rust stains running down from the pintle/rudder stock which is probably stainless steel are a bigger concern. What kind of boat ? Did this boat sit for a long time in water without moving ?
 

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Discussion Starter · #13 · (Edited)
1972 Tartan 30. Has not sat at all as far as I know. Not at least in the last 8years for sure. Boat is in great shape for its age and I sailed her all year last year. This is just my first spring and I want to be on top of things.
 

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Discussion Starter · #14 ·
any other insight into the rust running down the pindle. If its stainless? I doubt it would have iron looking rust? Is this corrosion that I should be highly concerned about or perhaps water running out of the wet rudder and picking up some gunk along the way that I may not have to be overly concerned about? Also, I was recomended to re paint with this ALUMINUM PAINT - Aluthane - MCU coating INFO PAGE

Anyone know what this red lead paint is that someone above mentioned.
 

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Discussion Starter · #15 ·
Hard to believe that gudgeon is anything but bronze. The bronze has likely been faired over with some kind of putty that has absorbed water and is blistering. Highly unlikely it is anything more serious than poor quality fairing compound soaking up some water.

The rust stains running down from the pintle/rudder stock which is probably stainless steel are a bigger concern. What kind of boat ? Did this boat sit for a long time in water without moving ?
Not sure what a long time would be but the previous owner was well into his 80's and I am told they did not use the boat alot the last few years. It is in MI so never is in the water for more than 6 months at a time. It is possible it sat that long but I believe he used it at least a couple time in the season.
 

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Not sure what a long time would be but the previous owner was well into his 80's and I am told they did not use the boat alot the last few years. It is in MI so never is in the water for more than 6 months at a time. It is possible it sat that long but I believe he used it at least a couple time in the season.
First of all you asked about "aluminum paint". Do not use this if it actually has aluminum in it as it will cause a galvanic reaction with the bronze gudgeon. It won't hurt the bronze but the paint will fail quickly.

The reason I asked about how long the boat had sat .... The rudder stock being stainless steel will corrode in the absence of oxygen. I have seen stainless steel shafts break when boats have sat is water for some years without moving (in Lake Ontario). The rust stains may be from the rudder stock. The photo below shows a stainless shaft that looks acceptable from the outside while the inside looks like a Cadbury Crunchie.
 

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Discussion Starter · #18 ·
ok, I poked around a tad and I found that the vc17 rubbed right off with a wire brush. the light blue/grey underneath is the epoxy sealer. Not sure what was used. Right under that is a copper/bronze color. Just looks like some of the sealer was blistering. Should I remove all of it and re seal or just clean up the blisters well and go back over it?
 

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Discussion Starter · #19 ·
forgot to add pics.





I know I have to clean it up a lot more than that. I just thought I get a response before I went further.
 
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