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New boat - Stainless fitting rusting?

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New boat - Stainless fitting rusting?

Old 02-10-2016, 12:55 PM
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Default New boat - Stainless fitting rusting?

I just purchased a used 2014 Cobia 201. The boat is basically brand new as the guy I bought it from just purchased in April. I still have the bumper-to-bumper warranty through April and went through the boat in detail this weekend trying to find items I want to have the warranty address before it runs out.

In general, the boat looks great. One item that bothers me is that there are rust stains around most of the cup holders and some of the other stainless fittings. I don't understand why these items would be rusting. I would think Cobia would use better quality fittings than this. Any thoughts on why this might be happening? You think this would be a legit warranty claim?





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Old 02-10-2016, 12:59 PM
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I've seen similar problems on new boats...but not on large hardware like that. It seems to happen when the metal is completely flush with gelcoat/fiberglass. Problem was solved with a small barrier of caulking/sealant or a plastic washer between the hardware and the deck. Depending on the fixture, it should solve the problem.

If you have an issue, talk to Cobia direct.
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Old 02-10-2016, 01:02 PM
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Originally Posted by CaptSamShurhold View Post
I've seen similar problems on new boats...but not on large hardware like that. It seems to happen when the metal is completely flush with gelcoat/fiberglass. Problem was solved with a small barrier of caulking/sealant or a plastic washer between the hardware and the deck. Depending on the fixture, it should solve the problem.

If you have an issue, talk to Cobia direct.
Agree. The hardware should have been installed as described above. The boat is a 2014, I would doubt a warranty that covered these issues would have been more than 12 months from the purchase date.
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Old 02-10-2016, 01:03 PM
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2 of my cleats on my 237 have the same. I use hull cleaner on the fiberglass around the cleat, without trying to get it on the metal. I keep my boat pretty clean, but it doesn't bother me too much....Okay, it bothers me a little, but not enough to remove, inspect, clean/replace and rebed with sealant.
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Old 02-10-2016, 01:22 PM
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That is normal and will happen to any boat. Use Davis FSR and apply with a paint brush while you clean. Let it sit for a few minutes and rinse. It's that simple to use.
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Old 02-10-2016, 01:40 PM
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The rust at the interface btwn the stainless & fiberglass can mostly be solved by "bedding" the fitting using a marine sealant. Requires the fitting be removed/cleaned/reinstalled. There is a term for this kind of corrosion which escapes me. Other threads on here cover this.

The rust on the surface of the cupholder is more curious as it indicates the metal itself or corroding. Most stainless does not do that.
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Old 02-10-2016, 01:50 PM
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Crevice corrosion. Stainless steels are susceptible to it. As for the cup holder--it is a stamped part. The rust on the surface is cause by surface impingement from the tooling. In other words, small amounts of steel are embedded in the stainless material contaminating the surface.
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Old 02-10-2016, 02:00 PM
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Originally Posted by finsleft258 View Post
Crevice corrosion. Stainless steels are susceptible to it. As for the cup holder--it is a stamped part. The rust on the surface is cause by surface impingement from the tooling. In other words, small amounts of steel are embedded in the stainless material contaminating the surface.
Good info on the cupholders. Never would have thought of that.
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Old 02-10-2016, 02:39 PM
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Originally Posted by followotherboats View Post
That is normal and will happen to any boat. ...
Normal? I guess to the ones not built correctly. That hardware should be sealed better. Or maybe also boat is not cleaned well after use.
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Old 02-10-2016, 03:32 PM
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Not all stainless is rust proof. In particular, "chinese stainless" is an oxymoron.
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Old 02-10-2016, 03:34 PM
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Originally Posted by CaptSamShurhold View Post
Good info on the cupholders. Never would have thought of that.
One of our local respected boat builders told me that they never drill stainless with the same bit they drill steel.

PS: Great products!
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Old 02-10-2016, 03:35 PM
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Clean it with barkeepers Friend and a toothbrush every few months. Works great, doesn't take five minutes and is more fun than dealing with a boat dealer
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Old 02-10-2016, 03:54 PM
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Originally Posted by stuarbc View Post
I just purchased a used 2014 Cobia 201. The boat is basically brand new as the guy I bought it from just purchased in April. I still have the bumper-to-bumper warranty through April and went through the boat in detail this weekend trying to find items I want to have the warranty address before it runs out.

In general, the boat looks great. One item that bothers me is that there are rust stains around most of the cup holders and some of the other stainless fittings. I don't understand why these items would be rusting. I would think Cobia would use better quality fittings than this. Any thoughts on why this might be happening? You think this would be a legit warranty claim?






Yes poorer grades of stainless steel are becoming more widely used these days as manufactures try to keep the over all prices down of finished boats . Coatings of polish's and waxes and silicone type sprays with be next on the list for sure !!Coming out from underneath can be from the fastenings nuts and washers etc that get used !!
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Old 02-10-2016, 04:16 PM
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Originally Posted by billinstuart View Post
Not all stainless is rust proof. In particular, "chinese stainless" is an oxymoron.
Stainless simply means it stains less. I've come to terms with the fact that the south eastern coast of NC is so durn corrosive that stuff is gonna rust no matter how hard I try to stay ahead of it. There are signs of rust on EVERY boat in my marina, even relatively new models from "top notch" builders. I used to remove fittings, polish, re-bed. I spent hours upon hours buffing cup holders and cleats. I finally realised that I spent WAY more time detailing the thing than actually using it. I no longer let my panties get in a bunch when I see some rust.
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Old 02-10-2016, 04:35 PM
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Originally Posted by TTB View Post
Stainless simply means it stains less. I've come to terms with the fact that the south eastern coast of NC is so durn corrosive that stuff is gonna rust no matter how hard I try to stay ahead of it. There are signs of rust on EVERY boat in my marina, even relatively new models from "top notch" builders. I used to remove fittings, polish, re-bed. I spent hours upon hours buffing cup holders and cleats. I finally realised that I spent WAY more time detailing the thing than actually using it. I no longer let my panties get in a bunch when I see some rust.
Stainless is a class of steel which contains Chromium, and sometimes molybdenum and/or nickel. These added metals tend to make stainless likely to oxidize, among other properties they impart to the steel.
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Old 02-10-2016, 05:05 PM
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I have the same problem and I use Rust Remover and it works fine. The problem is that plain stainless will rust. Stainless 316 will not and is very expensive. I was quoted a price of 10.00 for 3 10-32x2 1/4 SS316 screws for my macerator pump.
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Old 02-10-2016, 05:21 PM
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I would love to see Skip chime-in on this.
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Old 02-10-2016, 05:25 PM
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https://www.youtube.com/watch?v=1RZ3K1-8wxQ

this gemlux video really goes into some good detail on the "ring of fire" as he calls it.
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Old 02-10-2016, 05:31 PM
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I wax all my stainless before installation all the way around. For parts you don't see it stays on white.

But this is a bit different. Uninstall, some Mary Kate's on gelcoat(very little), rinse let dry, wax area, and put lifeseal to seal it. Lifeseal the screws too. That should do it
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Old 02-10-2016, 05:37 PM
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Originally Posted by billinstuart View Post
Not all stainless is rust proof. In particular, "chinese stainless" is an oxymoron.
This along with their tin, iron, nickel, aluminum etc.....
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