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Go Back   SailNet Community > On Board > Gear & Maintenance > Survey found corrosion in mast
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Thread: Survey found corrosion in mast Reply to Thread
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Topic Review (Newest First)
05-01-2013 12:27 AM
Racecase
Re: Survey found corrosion in mast

I know this post is old but just for the information: This type of corrosion is whats called filiform corrosion which is basically when water gets between the paint and the metal due to a scratch or ding in the paint. The aluminum starts to corrode because it cant re-passivate itself since its still under the paint and just corrodes from there. If the owner had seen the paint "bubbling" early, and stripped the paint the hole in the mast could have been prevented.

Also, this didnt happen from the mast having sitting water in it but water between the paint and the mast, probably due to a poor application of the paint or the preparation of the mast for paint. That being said, only the part of the mast that had the "bubbles" under the paint would need to be removed and assuming this hasn't happened anywhere else, the mast would be structurally fine. But a thorough inspection of the mast would need to be done since it was painted/prepped all at the same time.
08-21-2012 10:06 AM
canadianseamonkey
Re: Survey found corrosion in mast

I should of read your last post...oops! Congrats on both decisions. Sailing is much more fun than sitting on the hard sweating your ass off working. Happy sails!
08-21-2012 10:04 AM
canadianseamonkey
Re: Survey found corrosion in mast

Catalina 30's are a dime a dozen...find one that doesn't have major issues. Run away from this one quickly. You'll be dumping money into this boat right away and you're sure to find other hidden issues as well as you get to know the boat.
08-20-2012 07:47 PM
Minnewaska
Re: Survey found corrosion in mast

Congrats on the new boat. The last one was trouble in the making. Enjoy sailing, instead of fixing!!
08-20-2012 06:39 PM
Brewgyver
Re: Survey found corrosion in mast

Just realiezed I never revisited this thread. I did pass that boat up, the seller made that decision easy when they would not reduce the price to reflect the cost of the repair. I bought another Cat 30 three weeks later. She was a few years older, and had tiller steering and A4 compare to the other's wheel steering and diesel. BUT she had had the mast, boom, and ALL standing rigging replaced less than two years ago.

BTW, the last time I looked (in the last 2 weeks), the other Cat was still on CL.
04-26-2012 04:25 PM
hellosailor
Re: Survey found corrosion in mast

Typical problem, and yes that is a typical cure. As long as it is done properly (strong & keeps alignment and mast height) cutting off the bottom of the mast--clean and level--and putting a step under it is nothing new and nothing to worry about. And if the new mast step is fabricated properly, with some weep holes, the problem won't recur.

HOWEVER, it does mean taking down the mast and doing some work, and that should mean a substantial price adjustment to reflect the job.

At the same time you might want to rerig the standing rigging, since the mast will be down anyhow.
04-26-2012 01:29 AM
SloopJonB
Re: Survey found corrosion in mast

Quote:
Originally Posted by Tempest View Post
There's really insufficient information to give a definitive answer. Is this a market priced vessel? or a fire sale? Rhetorical...

There's paint still covering the base, I can't tell when I blow up the photo how deep that black spot is. Looks like it's shedding metal ? A shortened mast affects everything, rigging, sails, boom height, etc...it's a ripple effect.
I believe that "black spot" is where the mast wall is completely perforated. Shortening the mast MUST be offset by increasing the step height a corresponding amount - there is no other option or you would have to re-rig the entire boat.
04-25-2012 08:54 PM
souljour2000
Re: Survey found corrosion in mast

I'd move on...that looks pretty rough and $$$$ to fix no matter how you slice it...boat-buying should be more fun than that unless you get the thing for huge discount of say... 4-5 grand off asking price if everything else checks out...a new mast and install is gonna be close to that on the cheap end I would think...
04-25-2012 08:43 PM
Tempest
Re: Survey found corrosion in mast

There's really insufficient information to give a definitive answer. Is this a market priced vessel? or a fire sale? Rhetorical...

There's paint still covering the base, I can't tell when I blow up the photo how deep that black spot is. Looks like it's shedding metal ? I had some minor pitting and peeling paint on the base of my keel stepped mast and had the yard remove the paint up about 2 feet smooth, and epoxy paint the base. I didn't have anything like the crater you have there. And you can't see what's behind the collar.

In either case the mast needs to come down, the paint needs to come off for inspection. Then you'd have to be prepared for a minor fix..or a major adjustment to your rigging. Worst Case scenario a new mast.

A shortened mast affects everything, rigging, sails, boom height, etc...it's a ripple effect.

Catalina 30's must be a dime a dozen...This would probably send me looking for another boat.
04-25-2012 08:41 PM
SloopJonB
Re: Survey found corrosion in mast

Quote:
Originally Posted by Brewgyver View Post
The surveyor thought the cure might be to cut off the bottom of the mast, and fabricate a step thick enough to make up the difference. Brewgyver
I did that with the keel stepped mast on my boat - took 2" off it and made the new step 2"thicker - it needed a new step anyway so it was no biggy.

Yours is different in that you have those halyard exit boxes right where it will have to be trimmed - they will need to be reinstalled higher as well. Good luck getting the fasteners out of them.

Either get a big discount on the boat to cover all the work or keep looking. Paying pros to do it all will be $$$$$.
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