We have some old IKEA kitchen units that we want to paint in eggshell.
I wanted advice on the best preparation for the doors.
My only experience with painting wood has been re-glossing doors etc. and I haven't used eggshell paint before.
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Assuming the kitchen unit doors are solid wood (not covered/laminated some how):
Mark/Label the doors so you know which door belongs to which kitchen unit.
Remove the doors from the kitchen units.
Remove all hardware from the doors.
Depending on how the doors are currently finished, you will either:
Fill any unwanted gaps, holes, etc in the doors. After filler has dried you will probably have to re-sand lightly.
Wipe them clean with a tack cloth to remove dust, you may also want to take the time & clean them with a "mild" household detergent or mineral spirits (specialty paint surface cleaners are available, but generally aren't really needed).
Set-up a door hanging paint station.
All of the above & more can be seen here: How to Paint Kitchen Cabinets via This Old House