Hi Sus - At 165euro per kg DWH 310 is very expensive. I pay $20AUD for a very good epoxy and add steel fibres myself. I doubt DWH310 is self levelling due to the fiber addition. That sort of product is great for its application. I have used all sorts of metal and lubricant additives in epoxy for all sorts of reasons. Best plan is machining though for a mill build. It's still only E=8700MPa so its a stiff filler. Good plywood is stiffer MDF is 4500MPa.... Peter