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CounterTek CTS Pro (formerly StoneLok MLT Plus)

ATG CounterTek CTS Pro - for Concrete, Terazzo, & Stone


ATG CounterTek CTS Pro (formerly StoneLok™ "MLT Plus") is a waterborne sealer made from minute particle-size polymers that penetrate tight surface matrices and bond perfectly with ATG CounterTek epoxies for superb protection against soiling and chemical contamination.


  • Low VOC
  • Use indoors or out doors
  • Abrasion and Chemical resistant
  • Apply with HVLP Sprayer
  • Available in Gloss, Low Gloss and Extra Low Gloss
This product cannot be allowed to freeze during shipping. Orders placed with FedEx Overnight Shipping are typically shipped out within 1 business day. Orders placed with FedEx 2 Day, FedEx Ground or FedEx Home Delivery will be shipped out when a safe shipping window arrives. Please contact us if you would like to update your shipping method or order. 


Available In:

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Pint: ~40 - 80 sq. ft. per coat

Quart: ~80 - 160 sq. ft. per coat

Gallon: ~300 - 650 sq. ft. per coat

5 Gallons: ~1,500 - 3,250 sq. ft. per coat

Two coats recommended for most substrates.

First Coat: ~400 sq. ft. / Gallon

Second Coat: ~600+ sq. ft. / Gallon

Directions For Use


ATG CounterTek CTS Pro can be used directly over properly prepped concrete, engineered cements, or other cementitious substrates; or as 2nd, or 2nd and 3rd coats following one or two coats of ATG CounterTek Epoxy Gen 3 or ATG CounterTek 6 NanoCoat.

Under some “at-risk” substrate conditions and typically on countertops, W-O/S Substrate Conditioner is recommended prior to application of sealer for increased durability and superior adhesion and performance.

For installations that have been unprotected and/or prior treated with wax, sealer, stain and/or cleaning agents, CONTACT ATG for detailed cleaning and/or concrete prep instructions. Mask as needed. Surface must be dry & dust-free; 7 - 8 pH; >60º F and <80º F.; with no salt residues and no laitance.

  • For Matte and Low Gloss finishes, shake ATG CounterTek containers thoroughly to be sure matting agents are in emulsion.

    Note: If material has settled out, and matting agents do not go easily into emulsion, pour off half the container and shake again. It may be necessary to strain through a small sieve and then shake thoroughly again. Let foam settle. (Gently swirl container(s) for Gloss).

    30 minutes prior to use, add 1 small bottle Activator to large bottle ATG CounterTek CTS Pro. Shake thoroughly. Then add 1 small bottle Binder. Shake thoroughly again.

    Note: If you want to use less than a full unit, measure out ATG CounterTek CTS Pro and add 1.7% Activator and shake. Then add 1.7% Binder and shake.

    Pot life of mixed solution is about 6 hours after induction time, longer if kept in closed container.

  • Apply using HVLP or airless sprayer. Hold sprayer nozzle a consistent 8" - 10" from the surface and work an area about 100 - 300 sq.ft. or as convenient to the layout. Move slowly enough to get the entire surface very wet -- but do not allow ATG CounterTek CTS Pro to "pool". If sprayers are not available, 3/8" or less rollers may be used.

    Work must be in fast, relatively short, even-pressure strokes to avoid overlap marks. Never apply in straight lines and never pour product onto the raw substrate. Use painter’s technique of “V” or “W” lay down, fast spread, and light backroll. Always works wet to wet.

  • Allow to dry for 2 - 8 hours. If specified, mix, activate, induct and apply 2nd coat as above with maximum amount of product before pooling.

    Note: Temperature of about 70ºF, good air circulation and low humidity help drying process. The longer between coats, the shorter dry/cure time After the 2nd coat.

FOLLOW POST APPLICATION PRECAUTIONS (see separate sheet) that include:

  • Do not clean for 48 HOURS. Best cleaning method thereafter is RJSC StoneCleanTM "60", PLUS or "104" in recommended dilution.
  • Never use abrasive pads or aggressive cleaners.
  • Do not put tape on ATG CounterTek-SEALED surface!
Do not drag furniture or other sharp objects across sealed substrate!