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How to remove damp stains?

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RichM

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Hi,

On my narrowboat, I have some damp stains on some oak ply walls. On one of the walls, I sanded it back which removed the stain but unfortunately damaged the veneer to the point where I had to paint over it. What I did learn from this though is that the stain does not go through the entire wood.

I have so far tried oxalic acid without success. Is there anything else I can do? Replacing the wall would be an issue because behind it is a shower with decorative tiles.

Thank you

Rich
 

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mainebluedave

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oxalic acid you would think would do the job . I have used mould and mildew blaster for same type symptoms with good results. spray leave a while , wipe off. dont let it get on your clothing tho its like raw bleach.
 

Richard S

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The problem you have is moisture related, most likely from the shower behind. I would guess failed grout or mastic joint. Fix this first or the problem will just re-occur. This is week point in most narrow boat designs. Over board with 4mm veneered ply. You will not remove the stain. I’ve done this repair more times than I care to recall.
 
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