Because water based paint doesn t bond well with the glossy surface of oil based paint remove as much gloss from the surface as possible before repainting.
Oil based paint for doors.
You can however paint water based over oil based paint.
And because the resin of an oil based paint.
When i paint windows doors and trim i want the hardest least tacky and most durable surface i can get and that is usually an oil based enamel.
Do not apply oil based paint over a layer of water based paint.
If this is the case you must know the base of the last layer of paint applied to the door.
So if you paint oil based paint on top of a latex paint without priming first the latex will flex so much underneath that the oil paint will quickly fail.
You can get away with painting a latex paint on top of an oil based paint without primer but just to be safe it s always a good idea to prime first when you are switching from one type.
This is especially important if the door is unfinished but even if it has a finish the primer aids adhesion of new paint.
Areas like indoor doors trims and moldings most commonly receive a neutral or white paint variation while walls usually get more color.
If your door is in good shape with no cracking or peeling paint you may be able to paint over the door with very little preparation.