For bonding small polycarbonate parts, cyanoacrylate glue (aka Super-Glue) is an option. Superglue does have its limitations however. It is not suitable for use in applications which require impact strength or applications where water exposure is inevitable. Superglue is not suitable if the gap between the materials being glued is in excess of approximately 0.5 mm & excess application of superglue may lead to stress cracking on the polycarbonate. Only suggested for small gluing applications.