White glue (polyvinyl acetate, or PVA): PVA glue is a white liquid, usually sold in plastic bottles. It is recommended for use on porous materials -- wood, paper, cloth, porous pottery, and nonstructural wood-to-wood bonds. It is not water resistant. Clamping is required for 30 minutes to 1 hour to set the glue; curing time is 18 to 24 hours. School glue, a type of white glue, dries more slowly. Inexpensive and nonflammable, PVA glue dries clear.Cyanoacrylate: Also called super or instant glue, cyanoacrylate is similar to epoxy but is a one-part glue. These glues form a very strong bond and are recommended for use on materials such as metal, ceramics, glass, some plastics, and rubber; they aren't recommended for flexible surfaces. Apply sparingly. Clamping is not required; curing time is one to two days. Cyanoacrylates dry clear.