top of page

Moeller Stone Care has been cleaning, protecting, and caring for natural stone, ceramic and artificial stone for over 40 years. Our aim is to provide consistent, high-quality products, as well as acting as a support partner for specialist companies in their stone treatment.


Moeller Stone Care HMK S239 is a modified silicone/acrylic base sealer that produces a tough, hard, and highly protective finish. For use on interior honed and textured stone surfaces. Not effective on polished surfaces.


HMK® S239 is a ready to use color enhancing surface sealant that reduces the penetration of water, dirt and grease into honed, brushed, sandblasted, flamed and riven soft and hard natural stone surfaces, agglomerates, concrete and terrazzo. The color and structure of the surface will be enhanced while leaving a high gloss finish. HMK® S239 is UV resistant. Facilitates regular cleaning and overall maintenance, especially on rough and textured surfaces.


Important: HMK® S239 will not be effective on most polished and very fine-honed stones, glazed ceramic/ porcelain, or non-absorbing surfaces. For internal use only. Do not use in wet areas or on polished, glazed, or non-absorbing surfaces. Clean the surface thoroughly before treatment using HMK® R155 Intensive Cleaner (diluted) followed by a flood rinse with water and allow at least 24 hours to dry (max residual moisture of 2-4%) before sealing. If underfloor heating exists, switch it off and allow the surface to cool to room temperature.


Instructions: Apply HMK® S239 generously and evenly to a chemically clean and dry surface with a natural bristle paint brush or the HMK® Z950-HMK Z951 brushes and leave to dry. One or two even applications are usually sufficient, depending on the porosity of the stone and desired color enhancement. Do not allow to puddle. Repeat treatment after 12 hours if further color enhancement is desired.


Drying time is about 4-6 hours. Protect the surface from rain and humidity for 12 hours. Do not apply to rubber, plastics, lacquered or varnished surfaces, and solvent-intolerant materials. Remove all foodstuffs from the area to be treated before work is commenced. Once dry the residual material is not harmful to health. For regular cleaning and continued protection use HMK® P324 Liquid Stone Soap.


Coverage: About 50 to 110 square feet per liter


Warning: Chemical product. Contains naphtha. Flammable. Keep away from heat, sparks and flame. Harmful or fatal if swallowed or inhaled. Ensure the area to be treated is adequately ventilated. Avoid eye/skin contact. If exposed wash/flush with water and seek medical attention immediately. Keep out of the reach of children. See Material Safety Data Sheet for more detailed information. Do not use the product in temperatures below 50 and above 80°F.


Storage: Store in a cool place and keep the lid tightly closed.


Testing: Always test the product in an inconspicuous area to evaluate suitability, coverage, and performance.


Limitation of liability: The liability of HMK® Moeller Stone Care and/or Vac MD, Inc. for defective products and any claims for damages whatsoever is limited to the purchase price of the products. HMK® Moeller Stone Care and/or ACI International shall not be liable for any consequential damages. No other warranty or representation is made or implied.

HMK® S239 Stone Sealer – High Gloss Finish

    bottom of page