High performance weather and water proofing sealer

Ultra Porous– RS500

High Performance Enhancing Solvent Borne Siloxane Sealer

RS500 was developed for protecting and weatherproofing extremely porous stone (limestone, sandstone, moss rock), concrete, masonry, stucco, cast stone, mortar grout joints, plaster and other very porous substrates. Ultra Porous prevents saltwater erosion, resists water based stains, and weatherproofs and protects. RS500 will also enhance and bring out the colors in most stone curing with a natural matte finish. Although designed for extremely porous substrates it is often used on denser materials/stone to achieve enhancing color effects. An Ultra Porous RS500 treated surface will inhibit and resist penetration for the life of the matrix. Because the matrix is a union of RS500 and the material it becomes part of the material and will not separate or tear from the surface.

For more information regarding this product, please download our Data Sheet & Application Guidelines.

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Application Highlights


  • Porous stone and tile
  • Concrete
  • Pavers
  • Mortar
  • Stucco
  • Plaster


  • Cures in 30 to 40 minutes
  • Darkens an enhances
  • Generally single coat
  • Matte finish
  • Safe, easy to apply


  • Indoors and outdoors
  • Horizontal and vertical


  • One gallon bottles
  • Five gallon pails

Regulatory Compliance: VOC Compliance; This product cannot be shipped to the following VOC regulated states: California, Connecticut, Rhode Island, Maine, Massachusetts, New Hampshire, Vermont, Delaware, District of Columbia, Maryland, New Jersey, New York, Northern VA, Pennsylvania, Parts of Arizona, Ohio, Illinois, Indiana. In addition, these counties in California: LA County, Riverside County, Orange County, San Bernardino County.