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Post Options Post Options   Likes (0) Likes(0)   Quote Smelly Buoy Quote  Post ReplyReply Direct Link To This Post Topic: Bubbling paint on alloy boat
    Posted: 20 Oct 2010 at 7:50am
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Hi, hope someone can help me here.

I have an alloy boat that has been painted topsides.  It is 11 years old, and in some places, I have noticed that the paint is bubbling, generally over a large area, but without any apparent cracking.  Aesthetically, I can live with it.  But my real concern is, is this a sign of some galvanic corrosion going on under the paint?  And should I be removing the paint and treating the metal beneath asap?

Cheers, Woody
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Post Options Post Options   Likes (0) Likes(0)   Quote Ronblue Quote  Post ReplyReply Direct Link To This Post Posted: 20 Oct 2010 at 8:08am
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I've got very little experience but I've seen that before and it was corrosion. Moisture gets trap between paint and aluminium as aluminium is actually (to a certain extend) porous (believe it or not)...
It's also frequent near bolts and fittings
I would get rid of the paint where it's happening and deal with the issue asap. But then again, I may be wrong here.LOL
good luck
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Post Options Post Options   Likes (0) Likes(0)   Quote Wide Load Quote  Post ReplyReply Direct Link To This Post Posted: 20 Oct 2010 at 8:29am
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Can you post pics?

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Post Options Post Options   Likes (0) Likes(0)   Quote Catchelot Quote  Post ReplyReply Direct Link To This Post Posted: 20 Oct 2010 at 8:44am
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Is the problem areas close to stainless steel fittings, nuts and bolts, etc?
 
If so a bit of electrolysis is happenning with dis-similiar metals, as ali does not like stainless and those fittings should be isolated from the hull with things like rubber washers, gaskets and heat shrink over bolt threads, etc...
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Post Options Post Options   Likes (0) Likes(0)   Quote tobez Quote  Post ReplyReply Direct Link To This Post Posted: 20 Oct 2010 at 9:23am
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thats whats happening - a product called duralac will help that
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Post Options Post Options   Likes (0) Likes(0)   Quote one leg Quote  Post ReplyReply Direct Link To This Post Posted: 20 Oct 2010 at 10:05am
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Originally posted by Cachelot Cachelot wrote:

Is the problem areas close to stainless steel fittings, nuts and bolts, etc?
 
If so a bit of electrolysis is happenning with dis-similiar metals, as ali does not like stainless and those fittings should be isolated from the hull with things like rubber washers, gaskets and heat shrink over bolt threads, etc...
as cachelot  say's electrolysis seem's to be the prob unfortunately the paint there will have to be removed and underneath the (electrolyis)( white powder corrosion ) removed ,etched ,undercoated ,and top coated again for the paint problem to be fixed .The bubbles in the paint will pop and expose the allie at those points after a while .sorry an ongoing prob unless diff metals isolated .
woman who say they are equal to men ,show lack of Ambition .
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Post Options Post Options   Likes (0) Likes(0)   Quote Smelly Buoy Quote  Post ReplyReply Direct Link To This Post Posted: 20 Oct 2010 at 10:07am
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Originally posted by Red Rabbit Red Rabbit wrote:

Can you post pics?


Will do
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Post Options Post Options   Likes (0) Likes(0)   Quote johnybegood Quote  Post ReplyReply Direct Link To This Post Posted: 20 Oct 2010 at 10:51am
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Got the same problem on our boat. All the raised paint bubbles are around either dome clips or canopy clips. Must be SS screws, thanks Smelly Buoy for asking the Q as it's helped me too.

got some pics of ours here too. thanks
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Post Options Post Options   Likes (0) Likes(0)   Quote johnybegood Quote  Post ReplyReply Direct Link To This Post Posted: 20 Oct 2010 at 10:57am
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Post Options Post Options   Likes (0) Likes(0)   Quote Smelly Buoy Quote  Post ReplyReply Direct Link To This Post Posted: 20 Oct 2010 at 10:58am
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Hmm, from my recollection, my bubbles were even present away from penetrations and fittings. Will check it out. Have emailed the manufacturer too.
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Post Options Post Options   Likes (0) Likes(0)   Quote Busted! Quote  Post ReplyReply Direct Link To This Post Posted: 20 Oct 2010 at 1:45pm
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Paint doesn't like sticking to ali.  Moisture penetrates the paint and lifts the layer and causes surface corrosion.  Different to electrolysis, but same effect at the end of the day.  11 years isn't a bad whack really, probably about due for a rub back and respray!
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Post Options Post Options   Likes (0) Likes(0)   Quote Wide Load Quote  Post ReplyReply Direct Link To This Post Posted: 20 Oct 2010 at 2:25pm
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I'd peel off a blistered section (take pics as you go) If it's corroding (powdery white substance if dry, jelly-like if wet) then you'll need to remove the paint (soda blast?) and decide if you want to paint again.

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Post Options Post Options   Likes (0) Likes(0)   Quote Smelly Buoy Quote  Post ReplyReply Direct Link To This Post Posted: 20 Oct 2010 at 2:32pm
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Thanks Red. Interestingly, the boat's top-sides are white,and the hull is dark green topped with Nylac.  It is the white that is blistering, the Nylacked area seems ok - thus far.
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Post Options Post Options   Likes (0) Likes(0)   Quote Busted! Quote  Post ReplyReply Direct Link To This Post Posted: 20 Oct 2010 at 5:56pm
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There will probably be small areas of crap under the green.  What is the inside nooks and crannies of the hull and bilges like?  Out of sight out of mind!!!
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Post Options Post Options   Likes (0) Likes(0)   Quote Smelly Buoy Quote  Post ReplyReply Direct Link To This Post Posted: 20 Oct 2010 at 6:08pm
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Originally posted by Busted! Busted! wrote:

What is the inside nooks and crannies of the hull and bilges like?  Out of sight out of mind!!!

Pretty good on the bare surfaces
Tangled Up In Blue
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Post Options Post Options   Likes (0) Likes(0)   Quote blackboat Quote  Post ReplyReply Direct Link To This Post Posted: 20 Oct 2010 at 6:37pm
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insulate all screws, bolts etc as the two different metals react ,,,bought a brand spanking new stabi couple yrs back and the paint reacted where the anchor fairlead was bolted on ,add to the fact that water then gets in there and you got a disprin 
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Post Options Post Options   Likes (0) Likes(0)   Quote Kings Marine Quote  Post ReplyReply Direct Link To This Post Posted: 21 Oct 2010 at 3:21pm
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Ah yes - bubbling paint on alloy boats. The short answer is not to paint a alloy boat......Emoticons
dissimilar metals (i.e. sst / brass & steel on alloy) will make short work of any paint. even as the photo shows an alloy rivet in a plastic canopy lug will also start the paint bubbling, and areas where there appears to be no fittings or anything will also bubble and corrode eventually.
One way to get good results is obviously the paint prep, including the type of filler/fairing product used, also try to drill all the holes required in boat (dash holes-light fittings-sw panels-rod holders- etc etc) and then paint boat, then fit accs.

The reason for this is, if you get any area where salt water can get in underneath the paint it will start to bubble
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Post Options Post Options   Likes (0) Likes(0)   Quote Hurf Quote  Post ReplyReply Direct Link To This Post Posted: 21 Oct 2010 at 8:14pm
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I heard that the ali sucks up water and this can lead to that same problem. Some boat makers bake the boat befor painting to dry it out.
THE FLOGGINGS WILL CONTINUE UNTIL MORAL IMPROVES.
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Post Options Post Options   Likes (0) Likes(0)   Quote Hamish_S Quote  Post ReplyReply Direct Link To This Post Posted: 29 Oct 2010 at 3:31pm
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So what to do? I have the same problem but I cannto find what to do... How much does it cost to repaint an 18ft boat?
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Post Options Post Options   Likes (0) Likes(0)   Quote back2black Quote  Post ReplyReply Direct Link To This Post Posted: 29 Oct 2010 at 3:36pm
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Soda Blast, prep and repaint! Google up NZ Sodablast as this is the best way to remove the bubbles without any damage to the surface or rubber/plastic bits
Auckland Blasting Services Ltd
Multi Media Blasting - Automotive/Marine/industrial/Residential
Ph: 0225278968 ( 02BLASTYOU )
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