You could hit it with deck sealer, but in my experience, wood that's exposed to the elements will shed it's bark eventually. Some species take longer than others and the sealer will certainly help delay the inevitable, but not completely prevent it. I'd have a plan for when it does start coming off, whether in two years or ten.
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I might recommend soak the bark edge with wood hardener.. mini wax makes the one i use, expensive though. Deck sealer won't harden the cambium layer, so I would treat it like rotted wood… or that thin layer may decay… but for outdoor shingles I might even add a coat of marine spar after. to resist the sheering of the bark from heat, sun, rain, and dry weather. 
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