bad water staining on beech frames

[darkan9el]

Hi all, while doing some decorating, I noticed some substantial water staining on what I believe to be Cedar frames i.e. windows, patio doors and sealed glazing units. See image below, as you can see its quite bad. I've tried sanding it out but that's a no go. The workmanship on this site is poor and very slapdash, I have spent the best part of a day just cleaning the plaster of all these frames. I think they are meant to be stained or oiled with osmo or danish, although I prefer osmo matt, I'm not sure which at the mo as I haven't had a chance to discuss it with the client.

So can I do anything about this, if so how?

TIA

Note: Changed wood type from Beechwood to Cedar

 

[foxhole]

Hot iron over tissue paper will draw out the moisture, small travel iron on any awkward spots.

 

[darkan9el]

Hi thanks for the tip, this is now dry timber but I'll try anyway.

 

[jerryjacson]

Hot iron over tissue paper will draw out the moisture, small travel iron on any awkward spots.

but you cant think that this is a lengthy process, and consuming time very much?

 

[darkan9el]

I'm not sure what you mean Jerry?

There is a lot of this around the place, these people are in the process of renovating a cottage and adding an Annex onto it, unfortunately I have come in late in the day and inherited these problems.

Personally I think some of the workers on this renovation are cowboys, the tiling is atrocious and the silicone work is worse still.

From what I gather, the wood stains are because of the tannin in the wood rising with the water and when the water subsides a tide mark of tannin is left. Its a damp place and they have just got the heating on so everything is starting to dry out.

I have read up that using an Oxalic acid or Oxalic based solution can remove these stains, being an acid type product I guess it has bleaching properties. I have a spare bit of cedar that I have deliberately wet to create the stain effect and will test out this theory.

Apparently this is quite a common thing with this type of wood.

 

[foxhole]

Hot iron over tissue paper will draw out the moisture, small travel iron on any awkward spots.

but you cant think that this is a lengthy process, and consuming time very much?

Takes about 10 mins, is that lengthy?, does not matter that timber is dry, also works for removing white stains from furnture.

 

[darkan9el]

I will try your method foxhole and report back, I think the oxalic acid approach is a delicate procedure but will try that as well just to see the effect and for future ref.

 

[darkan9el]

OK, the iron trick didn't work at all. The oxalic acid diluted 1:10 and dabbed on works a treat, I will take photo results when I get back there probably Wednesday.