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Curtaining. Where you apply too much paint and it slumps before drying. Very common mistake and prevalent on skirting, door panels and flats inside cupboards.
Using eggshell with little rollers is an decent option. You can roll gloss and then lightly brush it out, that's how a lot of pro gloss work used to get done.
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I find the Dulux Satinwood to be quite a fine balancing act - too thin and it doesn't have a nice finish, too much and it curtains. Also if you leave it more than 20 seconds you can't brush it out because it's already begun to dry.
Sometimes I seem to get the knack, other times I'm out with the sandpaper taking it back to a smooth finish.
Airhead
hvsds
rhowe
I've been using this for skirting and architrave - don't have much to compare it too though!
I imagine it's the same with any/all oily paints in that they have a bit more drag when you brush it on, and is liable to run/slump whilst it's drying if you don't brush it out when wet (perhaps that's just my terrible technique)
https://www.screwfix.com/p/leyland-trade-satin-brilliant-white-trim-paint-2-5ltr/75370