Do you need mediums for oil painting?

Related questions

1. Is oil paint waterproof?
2. Do you need oil for oil painting?
3. Will gesso cover oil paint?
4. How can you tell if a painting is oil or canvas?
5. Does oil paint dry darker?
6. How long do oil paintings last?
7. Is oil painting easy?
8. Do you use water with oil paints?
9. Can I paint over a varnished oil painting?
10. What is artist in art?

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