OK. As far as using organic materials, everything I use, I microwave first.
I have an old Microwave that I use for this purpose in my garage.
If you're going to do this, then by all means, stand there and watch.
Don't walk away or allow yourself to be distracted.
Otherwise, you can be the guy who burned his house down basing figures!!!
Next once everything is in place, I seal it with Matte Medium.
After that, my final chore is to Dulcote the entire piece.
So far, so good. No crumbling and no critters.