I'm going to need a fair amount of thickened resin and was wondering about using baby powder. Apparently talc is commonly used. Some say it absorbs water, others say its water repellant. I used amasil fumed silica and glass fibers so far but the fumed silica is expensive ($38 per gallon) and don't last very long. Talc instead of silica would be a lot cheaper. Also considering sawdust. I need it for making fillets along stringers and transom. Any thoughts?