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 Catalina 25 Specific Forum
 Standing rigging		  New Topic  Topic Locked
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steephen
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100 Posts
Initially Posted - 05/26/2003 :  16:51:06  Show Profile
I think this post got lost last week. Do they make a spray that one sprays onto shroud swages to bubble out if there's internal rust? My shrouds have no rust and no meathooks as is, and I don't know about replacing them, cost wise.

Stephen Z
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Dave B
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Mali
863 Posts
Response Posted - 05/26/2003 :  17:11:57  Show Profile
Stephen: Your original question is still a few topics down the list... Apparently, nobody's heard of that spray--I haven't. But stainless doesn't rust, per se, so I'm not sure of the utility. The oxidation on stainless makes a microscopic barrier that prevents further oxidation. Depending on the alloy, some of the oxidation layer may be slightly rust-colored. The primary danger with stainless is crevace corosion--cracks develop, at least in part due to a lack of oxygen.

Dave Bristle, 1985 C-25 #5032 "Passage" SR/FK/Dinette/Honda in SW CT
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Jody
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33 Posts
Response Posted - 05/28/2003 :  12:16:30  Show Profile  Visit Jody's Homepage
Stephen, I'll try to find a reference later ... I'm recalling this from memory.

One of the ways to detect hairline cracks and defects that are difficult to see is by 1) coating the suspect fittings with a penetrating oil let soak for a while (the oil will seep into the crack if there is one) then 2) wipe off with a volatile solvent like acetone, finally 3) sprinkle a powder (baking soda, baby powder, ...) the oil will seep back out of the crack making the powder stick and exposing any crack.

IIRC, someone else said welding supply places have a penetrating dye that is easier to use for detecting cracks.

I've never tried any of this but have kept it in mind as I believe my standing rigging to be 19 years old. Everything looked good when I put it up this spring. This fall I'll probably go through the trouble of one of these methods to detect faults.


Jody Larrow, '84 SR/FK
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Mark Loyacano
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247 Posts
Response Posted - 05/28/2003 :  12:29:44  Show Profile
West Marine sells a small dye penetrant kit: Cleaner, dye and developer (does what the aforementioned powder accomplishes. I use it every Spring. One kit will last a long time.

Mark L.
Cat 25 SR/SK #549
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.