"

It may be a good idea to avoid painting over the top and bottom edges of
a door so it can breathe a bit.

--
But if you have doors made of moulded (panelled) hardboard I would say it is
essential to remove the door and paint the bottom - otherwise it easily
de-laminates - or swells if it gets damp (eg if wiping the door with a damp
cloth). It is like blotting paper and swells up.


John