How to make a Portal Gun

Step 12 Papier-mache the lot

With the front shell, I built up the shape with plasticine to thicken the shell and add depth. The big shell didn't need it so was left as wire. Each shell is then coated in several layers of newspaper strips and a mixture of 50/50 PVA glue and water. You could use fibreglass resin if you wanted extra strength but the newspaper is just as good and readily available. Use small strips of paper to prevent creases and cover evenly with the glue mix using a paintbrush (just like in Art Attack). This is particularly crucial on the large shell to get a smooth curvy finish. Cover the handle shell on both sides but the big shell only needs covering on the outside.