This is a tailor-made question for me, I just finished one door successfully. But after a thorough tanning with a hot air tanning gun and sanding, I repaint. Leaving the door only in its natural state can have a hook - in construction joinery, which also includes doors and windows, secondary materials are often used, so the door may look unsightly after removing the paint. But I would take that risk. So sunbathe, scrape, grind and then see ... (happy)