You can glue a sheet of mylar to another sheet with a contact cement spray. The spray will allow both sheets of mylar to dry flat without lumps. Mylar can be used for all kinds of craft and hobby projects that require a metallic finish. Using the right glue for mylar is important so when the glue dries, the mylar will not peel off.
Only use contact cement spray in a well-ventilated area. This type of glue is also flammable, so avoid using it near open flame. Wear protective gloves on your hands, if you desire, when using the glue spray. Avoid inhaling the fumes.
How to Glue Mylar
Lay out both sheets of mylar in front of you on a table. Make sure the surfaces to be glued together are clean and free of dust, oil, and dirt.
Point the spray nozzle at one sheet of mylar, with the surface to be glued facing up. Spray the contact cement spray evenly over one side. On the second sheet of mylar, spray the side to be glued in the same manner.
Place the first sheet of mylar over the second sheet and make sure it is positioned perfectly. Once both sheets are glued, they cannot be separated for straightening out. The glue will dry instantly.