Just mix it with Testors liquid cement (the kind from the glass bottle with a brush that has the viscosity of water, not the one in the black plastic bottle with the applicator tube). You can mix a little glue in or a lot, and make it as easy to work with as you wish. Also, make sure you knead the tube before you use it; sometimes it separates while it's sitting on the shelf. Mix the glue and putty in a well-ventilated room to avoid experiencing the '60s all over again.