Years ago, my grandfather use to do carpentry as a hobby. He would save all of the saw dust during (and after) his projects. If he needed any wood putty, he would take some of the saw dust and mix in some wood glue to the thickness that he needed and then use it to fill in the hole, gap, or what ever space he needed to fill. Afterwards, he would sand it smooth, and then treat it accordingly. (I am certain that some of you old timers out there know of this technique, so this is nothing new to you.) I decided that the same technique could be applied to paper modeling. Of course, using paper "dust". Just save the paper dust in a small bowl as you are sanding the parts that you need for other models (or you can just take scrap paper and sand it into dust). (NOTE: If you have a DRUMMEL DRILL, this will make the process easier and quicker) Save it in a seal-able container and use as needed. Here is a small (and simple) demonstration of what to do I have edge glue three panels together. Portioned out some paper dust. Added white glue (it is easier to work with for this technique). Mixed well (and added either more dust or more glue for the right thickness). Applied to the joined areas (like caulking or Spackle). Let dry, the treat as needed. This putty (or paste) can also be used to re-enforce contoured edge glued parts (where glue strips are hard to apply). To fill in gaps, holes, strengthen other joints, or even make other smaller contour shapes that are needed. The uses for this stuff are endless. Use you imagination and enjoy!!!