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Please don't paint your doors with emulsion.
F&B wall paint is a pain either the modern or estate have different problems. The pigments are very good though. I have painted a lot of f&b but I try to avoid it these days as there are better options. Little Green or Mylands would be my usual choice. That's for walls though.
f&b only do acrylic eggshell which can put a lot of kitchen painters off. There are not too many professionals who want to use it to paint kitchens. There's very little to recommend it except maybe the pigments having that certain quality.
Craig and Rose are decent acrylic eggshell paints and work well in kitchens. Decorators Guild if you want to pay f&b prices for Mylands paint but with great colours. There are a few specialist ones that you wouldn't want to start with. Unsurprisingly most kitchens painters are into paint brands most householders have never heard of!
If you mask up well beforehand then they can be quite good. I painted the inside of my garage walls with the £30 HVLP sprayer from Amazon https://www.amazon.co.uk/gp/product/B07BFF4PVX/ref=as_li_ss_tl?ie=UTF8&psc=1&linkCode=sl1&tag=youtubeco0322-21&linkId=a80898c8e05a88eb985cac086528190a&language=en_GB
as featured on https://www.youtube.com/watch?v=fwgxAEWUlgA
Thinning the paint was a bit of a pain but once we knew what proportion of paint to water we needed we could just repeat as necessary. It gets hot too, which dries the paint on the nozzle so you need to pick that off every now and again to clear it.
We did need a lot of coats, but even so it covered a large area faster than a roller.
The finish is great, and is really the only way to paint uneven and porous surfaces such as breezeblocks or old brickwork, plus the paint stabilises the surface, so less prep is required.
I imagine they are also the only decent way to paint Farrow & Ball modern emulsion which is fucking awful stuff to brush or roller on.