Can anyone enlighten me what and how could this happen. Cupboard made of HMR MDF board with Oak veneer finished as surface, at first is looks good but after 3 months it start to surface black patches.
I wonder if you have used anything steel on it? e.g. Wire wool ?
The thing is steel and oak do not go together. the most common problem you get is steel screws reacting with the oak and a dark stain forming. But it also happens if you use wire wool on the bare wood (including real veneers).
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