Condensation/mould on inside roof of new built shed.

Ian Taylor
last month

I hope you can give me some advice on my current predicament. During lockdown and retirement I built a 12' × 10' shed/mancave. All seemed well until recently when water penetration/seeping was coming through the featherboard which is causing condensation on the roof which is very damp and is causing mould. The roof was felted and sealed with a blowtorch no screws or nails used.The outside wood has been painted with Sadolin paint the result is visible from the outside as the water is just sitting on the surface ( Like a good car wax. ) Would it be ok to seal/paint the inside with something like Black Jack all weather roof coating?
I have attached a couple of photos.
Thank you and all the best for 2021.

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