Deluxe Materials Wonderfill 240ml. The next generation of strong lightweight fillers for foam and wood. An easy sanding, strong, lightweight filler designed to fill small gaps and indentations. Easily applied and smoothed with a damp finger and then sanded back. Does not crumble like other lightweight fillers and can be over-coated with Foam Armour (BD50) for improved surface toughness, and finish before being painted. Wonderfill is: One part, no mixing Tougher than other lightweight fillers Non shrinking Bonds wood, foam etc Water clean up Easily applied and smooth able with finger Slightly flexible like foam.