hey hey hey
just laid a deck in 90mm blackbutt in the hunter valley left it exposed and untreated came back 5/6 weeks later to treat it but--:eek:-- it is now cover in thin spotty black mould/stain like thing haven't got a clue as to what it is. The deck now looks about eighty years old.
It sands out eventally but will it return and am i best treating it with a stain, oil or varnish . any help or advice most appreciated