So, on coat of undercost/primer on all the steps and one coat of satin gloss on every other step tread.
It took so long for the paint to dry that we’re resorting to a quick drying type, which we’ll hopefully use tonight then leave to dry over night.
I painted only every other step so we could get up and down the stairs while they were drying and they’re starting to look good. We’ll paint them all white then have a think about the colours for the risers. This will be hard to mix in a smooth transition, so we might just do a random mix, using a single blended colour.