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123 will do it. Cover stain would be a good option to cover mould but it's not moisture vapour permeable. When you paint it with 123 you will pretty quickly see if the mould spot colour bleeds through.
The new one 123+ is supposed to be better at hiding. I used a lot of it earlier in the year and it does seem more opaque. A lot of suppliers deny it's existence at the moment and only stock the original variety.
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You might want to look at zinnser permawhite for the top coat (assuming it's white). Meant to be good for resisting mould. I've used some recently but too early to tell how it does.
Airhead
aggi
@moog
Painting a bathroom window frame after I repaired some wet rot with 2 part wood filler - is zinsser 123 followed by dulux diamond satinwood the way to go?
The bulk of the window paint is in fairly good condition but there are some light mould spots and the filler is unpainted.