the.com/sealer
the unsung bouncer that decides what gets in and what stays forever out
wax originsAncient Egyptians sealed jars with beeswax and resin
asphalt cousinDriveway sealer is basically coal tar painted thin
navy SEALsDifferent beast, but both keep water on the outside
vacuum trickRemoving air starves the microbes that spoil food
self-healingSome modern sealers reflow to close their own cracks