Should I apply a sealer to protect the concrete ornament?

Applying a sealer protects the concrete against the elements, thus preventing the ornament from antiquing on its own.  We suggest applying sealers on the inside of the fountain bowls and planters that hold moisture, and leaving the outside natural.  The sealer eases the cleaning of these areas which sometime become coated with algae.  If a special color or finish is applied, then a sealer prevents that finish from decaying, therefore maintaining a fresh look.