How do I repair these concrete countertops?

These concrete countertops are 18 years old. No one told me how to care for them. I have seen how to maintain them now, but I need advise on how to restore them and take care of them. The shellac is peeling and can be sticky. Replacement is not an option right now.

q how do i repair these concrete countertops

Peeling and bubbled

  3 answers