I have previously painted satinwood doors and frames, what preparation is required to over paint with eggshell, if any ?
just lightly sand with 120 grade sand paper
Sand so as to create key for eggshells and apply coating
Give the woodwork a light abrade with fine sand paper to key up the wood before painting, then give it two coats of undercover, then you can apply you eggshell.
Wipe over with turps and allow to dry sand down and apply undercoat and then 2 finishing coats of eggshell
Light sanding so it gives the paint a key to stick to . Fill any holes blemishes I use car filler it gives it a nice finish but that's my preference it's not for everyone as it goes off quickly. I always under coat then two top coats.