I've used a NO-VOC waterproofing product in the past for snake furnishings, but don't recall specifics now, it's been years. May be other brands available now anyway.
I've suggested to others using such a thing on branches but never have used it on my own branches as of yet, since I have an unlimited supply & as posted above, have
also had no real issues with natural branches from outside. And I mean too big to bake in my oven also...I do spray them down thoroughly with my chlorhexidine (diluted)
& dry in hot sun before using. A few have had bark beetles in...they bore holes eating the wood, but are harmless to snakes.
Mostly the waterproofing should help preserve your branches & make them easier to clean, assuming you have to buy them or have a harder time to acquire them.
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