Q: What is a sealer, impregnator and penetrating sealer? How do they differ? A: The terminology used in the stone industry can be confusing and often misused. The following are some definitions that will help clear up this confusion. Sealer - According to Webster's Dictionary, a sealer is a coat (as of size) applied to prevent subsequent coats of paint or varnish from sinking in. In other industries, such as the cleaning and janitorial industry, a sealer is similar in that it is a coating that is placed on the surface of a substrate to seal it so something else can be applied. In the stone industry, a sealer is also defined as a coating. In the scientific community, the proper description is called a "Film Former," since it forms a film on the surface of the stone when applied. Impregnator - Again, according to Webster's, to impregnate means to cause penetrate below the surface of the stone and protect from within. There is no coating or film formed on the surface of the stone.
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