Have to paint the cement floor in the "engine room" (where the heat pump & buffer tank etc. live). This is after scraping off all the lumps of plaster, sweeping & vacuuming, & coating it with a deep nano primer to seal in all the dust & small particles.
& this is after the first coat of paint which, for the base coat, needs to be mixed 1:1 with water so it gets into all the nooks & crannies in the surface.
I can't quite get my head around how different it looks.