Sealing Runes, recommendations?

[Elluir]

Looking for some recommendations.

I have been doing lots of experiments with new rune mediums. Something I am running into with making more fragile runes is needing some sort of seal for protection (for my homemade sand/clay runes for example). I'm trying to be natural/organic with everything I use to create them - paint has even been berry based or earth pigments.

Can you guys think of anything I can use to seal them that would still fall in an organic/natural product category? My crafty skills are still leveling up.

-Elluir

[Firebird]

Perhaps linseed oil or bees wax?