How are table tops at restaurants sealed?

You know when you go to a restaurant, and they have some kind of papers maybe relating to the site that used to be at the restaurant or about the family, encased in a plastic protective covering on their table tops? What is the plastic covering and how is this effect acheived?How are table tops at restaurants sealed?
Its either a glass top sealed by a rubber strip or a layer of shellac.How are table tops at restaurants sealed?
The covering is usually glass or plexiglass. It is sealed with caulk used for sealing bathroom tiles.
Go to Sherwin Williams , they have this clear epoxy like stuff , it comes in two parts ( a gallon of each ) it is poured on , it is the stuff like they use on bar tops to cover things such as old vinyl records , old pictures , and even old blue prints . I can not remember the name of the product but they will know if you ask them .



Or are you talking about Acrylic Glass (plexiglass) ?
It is a special kind of epoxy used called 70 layers or something like that, (that is not the exact name) but they will know what you mean at a good paint store.

It is put on to seal menus, pennies, almost anything onto the table top ; then it looks like 70 layers of varnish.

Sorry I cannot remember the exact name. I have seen something like it at Lowes or Home Depot too.
with an epoxy sealer,it can be found at a home depot or Lowe's

you mix part A with part B pour it on and it will simulate 50 coats of polyurethane in a single application.