Nic Thurman on Instagram: "Can you apply oil ground directly to your unprimed painting surface? No. Your surface needs be sized first.Traditional rabbit skin glue is the ideal sizing, but there are synthetic alternatives as well. Does it work on top of gesso? You can apply it on top of gesso but it’s not advisable. You should reall use glue sizing. Send me a dm if you want to get the oil ground prep course. Benefits of oil ground prepared linen: 1. Oil ground serves as a protective layer between