Watch this space. It's gonna happen.
One of these days, someone will nominate garden dirt as an epoxy filler.
Hey, it's good for standing on and it's cheap.

Parallax wrote:

I have been working on Minicup #2 but ran out of colloidal silica
epoxy thickener and do not feel like driving all the way across town
to West marine. So, I recalled some discussions about using talcum
powder or wood flour for this purpose. First, I used some of my wifes
powder till she found out and blew a gasket over it. I checked,
powder is expensive, makes the boat smell funny too. Then, I recalled
cornstarch is used as a thicken er for stews and soups and I had a
little and it worked fairly well. When it ran out, I used regular
flour, it does not work as well but is ok. I wonder if I could mix a
bug killer like Sevin dust with it to help preserve the wood.