Diy Wood Filler Without Sawdust . Now let the mixing begin. Using a putty knife, apply wood filler to each crack or hole you intend to fill. diy_wood_filler_pin1 Saws on Skates from sawsonskates.com The most common homemade wood filler for hardwood floors is sawdust mixed with glue. Add more wood filler to each hole than it appears can. Push the putty by hand into the gouge, scratch, or hole in the work material, then remove excess by hand.