With most all of today's sealants, and many of those from the past, I'd say no. You could use a paste wax on the bow if you were worried, but I shoot unfinished bows out here routinely and experience little issue with it. And our humidity often reaches 100%. A prolonged hunt I would have sealed my bow, definitely, but even an hour of shooting my issues in cast can be explained by my poor choice of test string.