27th Jan 2023, 06:29 PM
Back in the day, a door frame in my place had some unknown oil based product, like a polyurethane to show off the wood grain. I sanded it and went to paint it with water-based, and it literally split and some beaded! WTF I said. After cleaning up that little mess, thinking about it a bit, I then painted it with a 'modern' oil based undercoat, it stuck great, let it cure, then the water-based I wanted to use worked fine.
Moral of the story - YMMV :)