Jon1212
Birch! Please.....
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I mentioned 'micro-balloons' in an earlier post. Adding these to the epoxy resin thickens it, and converts it into a paste or filler. Used a lot in boat building.
West System is one of the better known brands, and offers a lot of technical info. You could contact them, describe your application, and ask their advice.
http://westsystemcom1.site.mobi/app/the-105-system/4965226/36/
Philbert
Thanks for all of your pertinent advice, @Philbet(gluten free cracker excluded).