Stone Guardian

Stone Guardian is a penetrating water, oil and stain repellant for concrete and stone with superior surface protection. This product offers protection against graffiti allowing it to be easily removed with only high pressure water. This product is designed for high-performance building restoration and preservation applications.


Stone Guardian is designed to penetrate the surface of the stone, filling cracks and crevices in the material to create a long-lasting repellency to oil, water and waterborne stains. This treatment will help to deter unsightly stains caused by mold and mildew as it prevents water penetration. This product is specifically designed for instances when penetration is needed in addition to superior surface protection. 


  • Penetrating action
  • Superior surface protection
  • Reduces leaching from stone materials
  • Graffiti protection
  • Fast drying; dries clear
  • VOC compliant
  • Great coverage rates
  • Low odor
  • Suitable for interior and exterior use
  • Safe to use on most stone without discoloration
  • Slip-free surfaces
  • Won’t fade, crack or peel
  • Provides long-term savings
  • Cleans substrate easily
  • Keeps surfaces looking new
  • Bonds surfaces
  • Creates a breathable surface
  • UV- and heat-resistant
  • Multi-surface use
  • Long-lasting protection
  • Easy to use


Will not bridge gaps in brick and block masonry. Not suitable for below grade use.

Horizontal or Vertical

Can be used on both horizontal and vertical surfaces.

Intended Surfaces

Designed for concrete, masonry and most stone surfaces.

Stone Guardian Product Info Chart
Solvent Water Based
Flammable No
User Friendly Yes
Economically Efficient Yes
Environmentally Friendly Yes
Color Slightly Yellow
Smell Unique

Surface Preparation 

Complete all caulking and surrounding construction substrate applications prior to using this product. Newly installed stone or grout must be allowed to cure before application. Protect against personal contact with this and all chemical products.

Prior to the application of this product, ensure the stone is completely clean and free from all dirt, staining and biological growth using any of Presto’s stone cleaning products. Make sure to thoroughly rinse the material to ensure no product is left behind on the surface prior to sealing. Any cleaning product left on the surface can interfere with the protective coating.  Never apply to a damp or wet surface. Do not apply at below freezing temperatures. Protect any unintended areas.


Use a low-pressure sprayer, roller, brush, sponge or lambs wool applicator. Product may also be back rolled. Do not dilute; apply full strength. Apply product to create an even coat on the surface. Allow product to saturate surface. Do not allow product to pool on the surface and dry, or protection will be uneven and a residue may form. Remove excess material with a rag or towel. 

A second coat may be needed for porous, absorbent surfaces or for superior protection. Subsequent coats should be applied in the same manner as the first while the initial application is drying. Never apply a second coat if two coats were not tested and approved prior to use.

Protection will begin immediately after sealant dries on the surface. Cure time for maximum water and stain protection is 24-72 hours. Protect surface from contact with water for at least 48 hours. Application rates, concentration, temperature and humidity can impact dry and cure time. Use towels or rags to polish the surface.

For parking garages: This product can be used after an initial deep-cleaning to repel water, oil and stains from the surface that will protect concrete from vehicle stains, such as motor oil and transmission fluid. Stone Guardian enables concrete surfaces to hold their repellency even after regular cleaning.

In many instances, a combination of different stone cleaning products is necessary for various stone surfaces depending on their level and type of staining. Presto offers a complete line of stone cleaning products for all situations, including:
  • Stone Restore® HD For difficult to remove mineral stains caused by efflorescence, rusting, red clay, iron, and more
  • Stone Restore® NC For general cleaning of sensitive stone surfaces that require a neutral cleaner
  • Stone Restore® A+ For heavy stains caused by oil, grease, grime and environmental pollution
  • Stone Restore® CT A citrus multi-purpose stone cleaner that removes oil and a variety of stains
  • Stone Restore® CB2 For difficult to remove biological stains
  • Stone Restore® PS For stubborn surface contamination on all types of polished stone


Clean tools and equipment with water. Clean any area that may have overspray. In the event Stone Guardian is allowed to come in contact with adjacent surfaces, dries and is difficult to remove, use one of the following surface restoration products:

Protected Surface Maintenance Instructions 

For exterior vertical surfaces on a building that is being properly cleaned using Prestos products, we recommend cleaning the surface every 2-3 years to retain a clean appearance and preserve the previous restoration. High pressure is not needed and may damage the surface coating and weaken its performance. This maintenance cleaning is not mandatory to ensure the coating will last as stated in the warranty and is only a suggestion.


The information provided by Presto for the safe and effective use of this product, and all of our products, is believed to be good and accurate. However, due to the many different possible applications of this product, careful considerations should be made when selecting its suitability for each surface.

The information provided should never be substituted for individual testing to ensure the product’s compatibility with each surface intended for use. The purchaser shall assume all responsibility for determining the suitability of this product. When used as intended, this product will perform as stated. No other warranty can be made for this product, verbally or written.

Presto warrants this product to be free from defects. In the event this product is found to be defective, we will provide a sufficient amount of product to replace the defective product.

View Our Precast & Concrete Before & After Pictures

View our Stone Restoration Pictures Featuring projects that utilized our many products for their building's restoration, maintenance or cleaning project.

After cleaning or sealing stone surfaces, the glass windows and metal frames almost always need to be cleaned, and many times window spots and stains will need to be removed as well. View our glass and metal products that compliment our stone restoration and protection products.

Don't Forget the Glass & Metal Surfaces
Justin McGarty,
Aug 24, 2020, 12:57 PM