Quality Park Dab-N-Seal envelope moistener makes it easy to seal hundreds of envelopes quickly. Adhesive formula glues as it moistens to securely seal up to 1,500 envelopes per bottle. Patented spill-proof spring-valve applicator won't clog so production keeps rolling along. This non-toxic, non-flammable and water-soluble adhesive cleans up with a quick wipe and water, making it ideal for paper crafts.Dab-N-Seal Envelope Moistener. 50 mL bottles. 4 Pack.THE ONLY WAY TO SEAL: Dab-N-Seal moistener in convenient spill proof bottles firmly secures envelopes or other paper products for work or arts and crafts.LAB-TESTED FORMULA: Fast-drying nonflammable, non-toxic adhesive conforms to ASTM D-4236.CONVENIENT SPILL-PROOF BOTTLES: Spring-valve applicator won't leak even when tipped over. The patented tip remains clog-free after repeated use. STOCK UP FOR EVERY NEED: Order a convenient four-pack for home, office and school. Each 50ML bottle secures 1,500 envelopes!