My cupboards are in a mobile home made from pressed board with worn out and peeling laminate. I read the Q&A about repairing the peeling laminate, “removed through hand scraping, a little sanding to knock down the edges, primer to seal the areas needing the repair and using either spackling

I have one long wall that goes into my dining/living room. The only thing divided it is a door frame in the middle of the wall. How can I paint each area different and make it look right. There is nothing dividing it at the top of the door frame.