mould under paint

Hi, My cellar, which has always been a little damp seems to have got much worse over the past few months. During some really bad rain I could actually see it seeping through the walls and pooling up on the floor. I've had the guttering cleared as there was some overspill at the time. I was...

How do i seal in black mould on wooden door and skirting boards? The wood has a yellow gloss base-paint/undercoat, from i guessing twenty years ago looking at the paint tin[ i inherited the house]. on top of that is 3yo matt white paint. The black mould is under the white paintwork, but not...