Mould on wood after staining

Discussion in 'Joinery, Woodwork and Carpentry' started by Susan Campbell, May 10, 2018.

  1. Susan Campbell

    Susan Campbell

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    I have sanded my interior window sill back to the bear wood to take off old varnish and sand out scratches. When i put on first coat of Ronseal varnish lots of little black mould spots appeared all over the wood. I sanded it back again taking out all the black and started again but the same happened. I have sanded and revarnished many window sills and never had this happen before. And no its not the steel wool!! Can anyone tell why this is and how I can solve it?
     
    Susan Campbell, May 10, 2018
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