Am looking to create a mill-able epoxy paste - I currently have to buy it in at high cost - but wondered if I could use a epoxy coating resin plus some sort of filler powder to replicate for test/non critical jobs. This paste is used for patterns - after undersize milling low density foam and then remachining after cure to form a high quality surface for coating.

The mixed uncured consistency is like that of pastry, and cures to form a 0.5kg/m3 density coating similar to that of body filler.

I think polyester filler uses talc - anyone know if this is likely to work in a similar way with epoxy resin?

Thanks all,