Quality Park Envelope Moistener w/Adhesive, 50 mL, Green - Never lick the flap again! Use Quality Park Envelope Moistener to seal envelopes securely and safely. The moistener adhesive helps seal any paper products, from business envelopes to mailers. Spring valve applicator resists clogging. Moistener is nontoxic and acid-free. Good for more than 1,500 envelopes. Safely secures more than 1,500 envelopes. For use on all paper products. Dries fast. Non-clogging patented spring-valve applicator. Spill proof bottle.