There may also be a protective or decorative layer on the outside of the article.

These often come with a protective layer that, when removed, reduce the value of the piece.

The protective layers of stone and metal make them feel secure.

Beyond those protective layers, the shields gave no warning before they killed.

It's best to wear a protective layer, such as gloves.

These finish types allow for the formation of a protective layer.

Her body made a protective layer over the Earth.

Police officers need to grow a tough protective layer of indifference.

The pastry when cooked created a tough protective layer around the food inside.

This is because the steel forms a protective layer on its surface under the influence of the weather.