Thank you for responding so quickly to my question. The follow-up question is: What are the details of preparation for priming, in particular, cleaning the wood in order to remove the stain that is already there? Is there a special solution to clean with?
Answer:
Actually, even if you don't clean it completely, a primer that is meant to be applied under either oil or latex paint should cover it for you. Once that's dry, you can paint to your heart's content.