Magicdust21 is perfect to fill holes and cracks and strengthen the adherence of two pieces The combined use of Colle21 Super Glue and Magicdust21 is deal for every DIY application, model building, restoration and repairs on a variety of materials. Use a sanding file to prepare the surfaces before glueing How to use the filler: Join the 2 parts to be assembled. Apply a drop of Colle21 Super Glue on the surface. Pour the Magicdust21 powder on the fissure. Repeat if necessary. Once finished, you can sand and paint the assembly for a nice finishing touch.