Overseals can be applied quickly with a mallet or even faster with our easy-to-use paint can closer, # 7855. These Overseals have passed Internal Pressure Tests of 95 kPa conducted in accordance with Title 49 Code of Federal Regulations, Part 173.27 when used with 1 gallon paint cans. they also meet UPS and US Post Office requirements. The Overseals are not reusable, but are recyclable. Normlock Overseals are suitable for paint cans from Freund, BWAY Corp., Ball, Grupo Zapata, & AllState Can. For one gallon cans.