Should I re-hydrate wood before I paint?

I purchased a severely damaged cedar chest and I'd like to paint the exterior. The interior is is pretty good shape and I think sanding it will bring back the cedar smell. The outside is extremely dry and looks like it was sitting in the rain.

The white isn't paint, it's water damage. I'm wondering if I should use oil or something to moisturize the wood before I paint it or will that make the paint not adhere properly? I plan to sand it but not sure if that's enough.

q should i re hydrate wood before i paint

The white area is from water damage not paint.

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