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U Glue is an adhesive that is heated and applied to the direct mail piece and is activated by moisture so it is a "lick and stick" glue. It is mainly used on return mail and intergrated envelope pieces.
Hot & Cold Latex is used to seal a direct mail peice and is very effective for heavy and difficult stocks. When the product is opened, the residue glue can be used to restick the product, or it can be easily rubbed off with your fingers.
Time Perforation is the process of adding perforations into a direct mail piece, so as to allow a form to be removed from the main mail piece or to tear open a product after it has been returned in the mail.