New kitchen, paint first?

[robodelfy]

big brush or roller, thinned with water. Like milk. the first coat should practically disappear as it soaks in. I like to apply a second coat but some disagree.

I'd scrub the black patches with sugar soap and rub off with an old towel until the wall looks clean.

Great, thanks I'll do that tomorrow. The patches that are black are behind the units anyway so its not that important, I was just wondering if I should seal them if its mould. I have no idea how to work out where or why its happening, if its current or historic!