WonderFill Strong lightweight filler For foam & wood. Deluxe Materials is delighted to announce Wonderfill, an easy sanding, strong, lightweight filler designed to fill small gaps & indentations in foam, wood etc. It is easily applied & smoothed with a damp finger and can be sanded back with coarse and then fine sanding tools. Wonderfill, when set, does not crumble like other lightweight fillers. Furthermore it can be over-coated with Deluxe Materials Foam Armour for improved surface toughness, & 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.