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Ask The Trades › DIY Forum › Painting, Decorating & Tiling Questions › black stains on windows

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black stains on windows (Read 2842 times)

gulpy10 GDPR opt-out	black stains on windows Nov 11^th, 2007, 2:05pm On some recently installed windows black stains are appearing on the woodwork. The windows are idigbo and coated with sikkens cetol hls, which contains a fungcide. images avialable at: http://privatewww.essex.ac.uk/~colbi/windows.htm How can the staining be prevented
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CWatters

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Re: black stains on windows
Reply #1 - Nov 12^th, 2007, 12:00am

Was it allowed to get damp before painting?

Google suggests this is a characteristic of idigbo...

http://www.woodconservatory.co.uk/whyoak.htm
"...most idigbo conservatories are painted due to the wood staining that can occur".

http://www.eoburton.com/Timbers/Idigbo.htm

"The wood contains a dye which may stain other materials when wet; it also contains tannin which causes staining when in contact with iron under moist conditions."

You anywhere near a dusty iron works?

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CWatters Super Member Offline "Daddy fick it" says James Posts: 5150 Total Thanks: 58 For This Post: 0 Gender:	Re: black stains on windows Reply #2 - Nov 12^th, 2007, 12:08am Google also found that some sikkens (eg Cetol marine) contains iron oxide. Perhaps worth calling Sikkens to see whay they say.
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