The glue can be applied partially or the whole surface. Such adhesive coatings can be used to seal one piece-mails or to stick on stamps.
Activated when the adhesive layer is moistened there is no longer any need for a separate envelope. The simple sealing method for the reply increases the rate of response and therefore the efficiency of your mailings.
Remoistenable glue is often used as response element for mailings or order forms.