Tiling on wood

[camerart]

Hi,
I have a butler sink, with a gap round two sides. I've just filled the gaps with wood, as a splash back approx 1ft high.
Is it ok to tile on wood?
I have plasterboard adhesive, if that could be used as a base before the tile adhesive, if it helps.
Cheers, Camerart.

 

[camerart]

Hi,
I searched for a while, then remembered I had 50% left from a shower tanking kit., so I used that.
Cheers, Camerart.