"Weeping" Stainless

Taras · Jul 9, 2011

All,

Does anyone have a good suggestion for removing the "rust" stain that occurs when stainless weeps onto the gel coat?

I have used acetone and didn't touch it.*

The stain is coming from a rear window where the stainless port hole meets the gel coat on the transome.

I guess "stainless" is really "stainmore" here.

*

Thanks for any help

2bucks · Jul 9, 2011

I used FSR (Fiberglass Stain Remover) when I had a boat that did that. FSR is a bluish gell that will take the rust stain away. Works good on the seawater "moustache" too.

The solution to the rust weeping is to pasivate the stainless. If the item has been cut or ground since manufacture then the cut area will rust. There are several ways to passivate, do a search and find one you like that will work on the area you're having the problem.

Ken

Keith · Jul 10, 2011

Wichinox paste will re-passivate the SS and hopefully stop it from weeping.

Larry M · Jul 10, 2011

I use Oxalic Acid.* You can buy it at hardware or marine stores in the US.* It should cost*less than $8.00/lb.* It's a dry powder and you mix 1-2 tables spoons in 1 liter of water.* It wall also take off the mustache.* After your all done, rinse with water.

Starbrite makes a product called Instant Hull Cleaner that will also work at ~20.00/quart.

-- Edited by Larry M on Sunday 10th of July 2011 10:27:26 AM

dwhatty · Jul 10, 2011

This stuff works pretty well. Oxalic acid based.

Taras · Jul 11, 2011

2bucks wrote:
The solution to the rust weeping is to pasivate the stainless. If the item has been cut or ground since manufacture then the cut area will rust. There are several ways to passivate, do a search and find one you like that will work on the area you're having the problem.

Ken

*I just learned something new.* Thank you Ken.** I have never heard of re-passivating Stainless Steel.* Read all about it with a google search.* Looks like you have hit on something here.

Thank you,

Taras

"Weeping" Stainless

Taras

Senior Member

2bucks

Guru

Keith

Guru

Larry M

Guru

dwhatty

Moderator Emeritus

Taras

Senior Member

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