Skip to Content
Serving All of Arizona 602-833-1122

Stone Impregnating Sealers in Wet Conditions

Beyond Stone Solutions Logo

Sealing Stone in Wet Conditions

There are no pat answers to sealing natural stone, which is why we recommend that an informed professional always be called on for determining the best solutions for your stone. Not only are there are many types of sealers that perform differently and accomplish different things, as you will see in the following article from Fred M. Hueston, Chief Technical Director for Surface Care PROS and troubleshooting expert, sometimes sealing may not be appropriate at all…

I receive several calls a week with questions about the use of impregnating-type sealers for use on outdoor stone as well as interior stone, such as showers, water fountains, and other wet areas. The questions are all basically the same: Should I seal my stone in wet conditions? Let me explain why stone in wet areas should not be sealed.

But first, there are a couple of definitions you’ll need to know…

Impregnators or penetrating sealers: Impregnators are designed to penetrate below the surface of the stone and deposit solid particles in the pores of the stone or to coat the individual minerals below the surface of the stone. These sealers restrict water, oil, and dirt from entering the stone. Impregnators can be solvent or water based. Most impregnators are vapor permeable.

Vapor permeable: Vapor permeability describes a stones breathability, or the ability to allow water vapor to pass through it.

The Case for Not Sealing Stone in Wet Environments

Most of the impregnators on the market today are breathable. This simple means that the stone will be protected from water entering the pores of the stone in liquid form but will allow water vapor to pass. Sometimes, stone is exposed to unregulated humidity and temperature fluctuations, and the result is condensation. Impregnators are breathable. Therefore, vapor can easily penetrate into the stone. One would think that this is positive, but once the vapor enters the stone it can condense and become a liquid. Since impregnators protect against water in its liquid phase, the moisture becomes trapped within the stones pores and will not escape until it turns into vapor and evaporates.

Trapped moisture can result in all kinds of problems. For example, stones with iron content can oxidize. If there are natural salts within the stone, the salt can dissolve and cause pitting and spalling in the surface of the stone. Aesthetically, the stone will appear darker since it is constantly wet.

More Research Will Be Necessary

There are currently several people in the natural stone industry doing experiments to demonstrate that sealer in wet environments can cause these issues and to discover in what circumstances, if any, sealers in wet environments may be appropriate. For example, sealed shower walls may be fine, while sealing the shower floor may pose problems. Although their findings are not yet published, I strongly believe that care should be taken when sealing stone in wet environments.

This is one of a series of articles written and published on behalf of Surface Care PRO Partners.

LET'S DO THIS! What can we make beautiful for you today?

Our highly skilled and talented team is ready to turn your vision into a reality.

Contact Beyond Stone Solutions Today!

A member of our team will be in touch shortly to confirm your contact details or address questions you may have.

  • Please enter your first name.
  • Please enter your last name.
  • Please enter your phone number.
    This isn't a valid phone number.
  • Please enter your email address.
    This isn't a valid email address.
  • Please lookup your address.
  • Please make a selection.
  • Please enter a message.
  • By submitting, you agree to be contacted about your request & other information using automated technology. Message frequency varies. Msg & data rates may apply. Text STOP to cancel. Acceptable Use Policy