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If I clear coat a stick from outside, will it stay ppreserved,and for how long?

What kind of stick, what kind of exposure? Is there bark, is it tooled like a dowel, etc?

Just a maple tree branch,cleaned lightly. For realistic dead trees.

Your best bet is a dull or satin spray lacquer, like Deft. As soon as you get the first coat on, poke it with a paintbrush to clear any bubbles made by the rough bark. Within a few minutes, spray again, and again a few minutes after that. For the last coat, turn the twig at odd angles to be sure you got into all the crevices. It should last years.