Begin painting in the upper inside corner of the door jamb and door stop.
Paint peeling off door frame.
Peeling at wood joints could largely be prevented by sealing the end grain with primer.
Load the upper third of the angled tip brush with paint.
The trade off is that the larger grit sandpaper will also scratch up the door frame itself so use a grit that removes the paint but doesn t scratch the frame.
The question was about doors or wood.
Use a linear up and down motion to cover the surface.
Fill holes and gouges in the door with vinyl spackling using the scraper.
Sand down the rest of the frame to remove any leftover peeling paint.
It s usually okay to paint over latex with oil based paint one possibility is simply age paint does not last forever.
However humidity also has a lot to do with it.
Wipe the sanding dust off the door using a clean cloth.
As long as you get all that old semi gloss paint off the door first and you have a rough surface to apply the new paint you should be fine.
It s best to paint inside in an air conditioned area.
Lack of primer likely 2.
Just look at the same trim after one coat of the primer and zero scraping or sanding.
Normally that is from 1.
With low vocs this water based binding primer is three times thicker than regular primers and locks down and hides peeling weathered surfaces to create a smooth white finish for your top coat.
Align the tip of the brush with the corner and move down the frame with a long sweeping stroke until you reach the bottom jamb.
The larger the grit 40 or 60 grit max the more paint it will remove.
Make the surface as smooth as possible even if that means you have to sand off the entire previous coat of paint.
Use a bonding agent intended for metal to patch steel doors.
Paint adheres well to drywall.
The end grain of window and door frames once exposed sucks up water like a sponge swells and further cracks the paint making the situation worse.
For example when latex based paint is used to cover a previous paint job that used oil based paint peeling will occur.
Incompatible paint layers will cause peeling paint.
Water sits in the corners is slow to dry and eventually breaks through the paint barrier.
