Ronseal filler wood high performance can be used to fill any depth and can be drilled, screwed or planed. Ronseal woodfillers high performance can be used for internal or exterior use. Available in light, natural or white, ronseal wood filler also comes in various sizes to fit any job you undertake. It can be stained, varnished and painted as it resists cracking or shrinking. Ready to use and rapid drying. It is best to sand the inside of the hole or gap, then ensure it is free from dust. Apply your filler with a putty knife, forcing it into the hole, then smooth the top surface before sanding to ensure a smooth flush finish.