I have just had some t&g jararh laid on my verandah. I oiled each board right the way round with Feast & Watson Decking Oil before they were laid.

They were all secret nailed down and it was looking great. Then the first night they were down it rained and the next day after the sun dried it all out I now have black spots where the water beaded and dried.

Any tips as to what went wrong, and what I nwo have to do to fix this?

Thanks in advance


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