If it was painted with oil based paint prime before using a latex based paint.
Oil paint for interior doors.
You can however paint water based over oil based paint.
The right paint should protect against dirt and human oils as well as the force from opening and closing which can cause dry paint to crack.
Your primer should be a similar shade to the final paint color.
By the early 1900s oil paints were incredible products that leveled beautifully created hard durable finishes and held up to the harshest conditions.
If this is the case you must know the base of the last layer of paint applied to the door.
Let the primer dry before painting.
Consider the following tips when painting an interior door.
If the door was originally painted with latex paint priming should be unnecessary.
Do not apply oil based paint over a layer of water based paint.
Paint the counters of the door with primer first and then use a roller for the flat surfaces.
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.
Choose whether you need to prime the door before painting.
Paint the door with an oil based primer.
After the first coat is dry pros often recommend sanding again using 320 grit.
Make sure to use interior primer for your interior door.
For interior doors we recommend the diamond brite paint 31000 which is specifically designed to protect high traffic surfaces.