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Howard
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.