Hello, first time posting, I made an account just for this problem. I painted two lemons the other day on some hardboard I Oil primed. I let the oil prime dry for the recommended 7 days before painting. Now a few days have passed since i finished the painting, and I have this weird separation and lines going everywhere. It looks kind of cool but also completely ruined the painting. What caused this? I dont want this to happen again. I have a lot of oil primed boards ready to paint on and do not want this happening on the paintings to come. This is my first time painting on oil primed hardboard. Any help is much appreciated!
First photo was when I just finished it, still wet.