How do I seal wood on a headboard?

Lou
by Lou

I fixed up a headboard to use as the back for a bench. I painted it with spray paint that was paint/primer. It has peeled and the wood has warped and cracked in spots. I took a wire brush and got off all the loose paint. How do I seal it so it I don't have to refinish it again next year? (Photo is from last summer)

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