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I think it's too risky to dilute it. Some people use a sponge and wet the surface they're painting, I've never had to do that, just keep moving at a reasonable pace and never go back over your work (difficult to resist when it's a drip on a door panel). You need to focus on completing the piece while keeping a wet edge to feather into, that gets harder to do with doors.
Quick drying often means water based, not exclusively though, and not all water based paints are quick drying. I have a few favourite eggshells, Little Green, Benjamin Moore & Ray Munn Porslin. For cheaper but decent finish there's Craig & Rose. Farrow & Ball is not too bad but the colour matching from tin to tin can be dodgy. Satinwood is not exactly eggshell though so you should probably carry on with that if you've started. I have Satinwood on a lot of my own woodwork but they had terrible problems with it ageing too fast in the early days and I'm not a huge fan of the slightly plastic finish it has, it's much more durable than eggshell though.
Fantastic, thanks. Sounds like undercoat will solve many of my problems. I'd been doing most of the other things.
The water-based acrylic undercoat is this stuff, right? https://www.duluxdecoratorcentre.co.uk/dulux-trade-quick-dry-undercoat
"quick dry" seems to be a Dulux euphemism for water based
Would you dilute either that or the satinwood? I haven't been