Worked on a painting over the Christmas holiday, got bored, has since dried. Was still in initial stages, but now having a hard time getting newer layers to adhere. What should I do to get started again and complete it this time?
Do I sand it to get some tooth?
Do I scrub into it with Turpenoid with a paintbrush to get some tooth?
Do I do both?
Do I paint over it with linseed oil and let it stand for a day?