BUILDING TIPS - Glue/Epoxy I hate to wait for glue to dry and not many common glues will work to adhere aluminum to aluminum. So I use 2-Part, 6 Minute, epoxy almost exclusively in the building of these planes where glue/epoxy is required. You can use ANY TYPE of epoxy and you can get it at your local Hardware Store, Hobby Shop or you can order it on-line from Tower Hobbies when you order your props. If you mix a little saw dust into your epoxy it will give it more Body. The only drawback to the epoxy is that it tends to be Brittle when it dries. For this reason, when it comes to making the Rotary Engines I use a common All Purpose Contact Adhesive like QUICK GRIP or WELDER. Both are available at Wal-Mart or Hardware Store. I just stack the Pull Tabs, hold them in place with a thin strip of masking tape, and then smear the contact cement around the INSIDE of the Tabs. The contact cement takes some time to dry so when I use it I usually make up several Radial Engines at a time and I allow the Pull Tab Cylinder Heads to dry over night.