High Performance Concentrate Sealing Solution, 5-(4oz) bottles make 5 Gallons of the most effective, industry leading solution to solving troubled envelope sealing issues / Comes in a concentrate; just add one 4oz bottle to 1 gallon of water / Whether high speed inserting, envelope providing a cleaner, more productive moistening system, sealing, stamp affixing or packaging tape dispensing, it seals tight every time / A combination of active ingredients fight bacteria and algae growth providing a cleaner, more productive moistening system.Our sealing solution is superior to ez seal sealing solution, which is PB sealing solution. Ez seal solution is higher priced and does not use our deionization process for envelope sealing. Our sealing solution is clear of all minerals and impurities. For best results it is recommended to mix with distilled water or deionized water. 600 USPS Approved Postage Meter Tapes for all your postage needs and a envelope sealing dabber bottle for less mess and more efficient sealing.