Order as many floor samples as you like and we'll ship all samples to you for free! You may then return them, within six months, and receive a refund for all returned samples. Please note: We do not reimburse for return shipping costs.
Permanent, penetrating, low-gloss sealer for concrete, masonry, stucco or brick
Cold Weather Alert:
This product may not perform properly if applied below the required temperature. Please check installation instructions on our website.
Because this is a water-based product, it may freeze during shipping. For that reason we will not ship over a weekend if temperatures dip below 32 degrees F. If you want us to ship anyway, it will be at your own risk. Please call to arrange with a GBS eco-advisor. 800.405.0222
GBS Penetrating Gloss Sealer is a waterborne polyester polymer and polyurethane with acrylic that works best on concrete, brick, stucco, and masonry. It waterproofs and preserves in 3-5 coats and comes with a 15-year waterproofing warranty.
Our Gloss Sealer penetrates two to four inches, filling molecular voids to completely solidify the surface. When it dries, it's actually part of the structure of the material. This means there's nowhere left for water to infiltrate and leak through. This also creates a stronger substrate that gives the surface a longer life.
Dry time for indoor surfaces is approx. five days; outdoors 2-4 days, depending upon temp and humidity. Allow 48 hours before walking on. Avoid using before rain.
Use it on basement walls and floors, retaining walls, pool surrounds, brick veneer walls, chimneys, fireplaces, concrete or limestone pavers, sidewalks, patios, warehouse floors and historical renovations. GBS Gloss Sealer should not be used in areas constantly under water. Not for garages or driveways due to hot tire pick-up.
GBS Penetrating Gloss Sealer has the same properties and benefits as GBS Penetrating Sealer which gives a matte finish. The difference is we've added acrylic to the formula that settles on the surface to provide a low-gloss sheen.
NOTE: GBS Penetrating Gloss Sealer will not work in conjunction with thinset. The sealer seals the pores of the concrete, thus not leaving anything for the thinset to bond to.
Any areas that have been power troweled, especially in basements, need to be acid etched before application. Please note this product will only perform well if applied correctly; be sure to read and follow the application instructions. For proper adhesion, the surface to be sealed must be:
Free of any other sealers, coatings, or stamped concrete release agents
Neutral pH — between seven and nine
Please see the application instructions for details on each of the above steps.
Whether you want to stop your basement walls or floors from leaking, or just want to prevent deterioration of your mortar in a brick wall, this is the right product for the job. It's a smart, inexpensive way to prevent problems before they arise.
Features & benefits
Permanent waterproofing — becomes part of your material; 15-year warranty
Superior durable finish — penetrates in; can't rub off; protects against freeze-thaw
Strengthens substrate — extends material life; reduces efflorescence and concrete dusting
Easy-to-use — sprays on; no mixing required; water cleanup
Non-toxic — no formaldehyde, ammonia, crystalline silica, ethylene glycol, mildewcides, fungicides, exempt solvents or aromatic hydrocarbons commonly used in sealers
Alert: This product will only perform well if applied correctly. Be sure to read and follow the application instructions. Please note that it may slightly darken the color of your material. Be sure to test to see how it affects your specific application.
State Nexus Fee may apply A state nexus fee will be applied to this item if drop shipped to the following states: . We're sorry for the inconvenience. Click here to read more about the state nexus fee.
Coverage (1 Coat)
Recommended # of Coats
3-5 coats until saturated. 3-5 coats will cover an average of 200 SF/gallon (depends on porosity)
Apply next coat after previous coat has been absorbed. Wet on Wet. Do not let dry between coats.
24-48 hours (outdoors), indoors 5 days (dependant on heat, humidity, airflow) and 1 month to fully cure inside the concrete.
brush, roller, roller - 3/8" nap, spray, spray is best
Application Temperature Range
Warmer than 55°F
Surface should be Clean, Dry, Neutral pH, Absorbant. Test BEFORE applying. Power-troweled surfaces may not absorb well and should be etched with Micro-Etch.
Apply in good weather when air and surface temperature are above 45°F. and surface temperature is at least 5°F. above the Dew Point. For optimum application properties, materials should be between 70-90°F prior to application.
1. Use a low pressure sprayer (Hudson type) or any sprayer operated at no more than 20 psi. Spray on with a low-pressure sprayer and back roll using a 3/8 inch nap roller any puddles into a dry area with a low nap paint roller. The goal is to saturate the surface. This may require 3-5 passes, one after the other, WET ON WET application.
Note: If the concrete was power troweled, GBS Penetrating Sealer may not absorb at all. Using our MicroEtch product will open the pores and allow for proper penetration.
GBS Penetrating Gloss Sealer covers approximately 200 square feet per gallon depending upon porosity.
2. Ideally you will work with two people. One spraying and one using a 3/8 inch nap paint roller to spread out excess (do not allow excess puddles to dry as results could be slippery). Clean the roller or brush with soap and water.
3. Allow to dry thoroughly before traffic is allowed onto the floor; indoors approx 5 days, outdoors 24-48 hours depending upon temp, humidity, and air flow; avoid using before rain.
4. Do not use on driveways or garages due to hot tire pick-up. Warm tires will bond to the acrylic and peel it off the surface of the floor. Use GBS Penetrating Sealer instead. Not recommended for submerged areas in pools or ponds. Do not use outdoors before it rains (within 24 hours). The normal cure time is 48 hours or longer depending upon humidity and temperature.
5. NOT recommended for use prior to painting. Use the regular GBS Penetrating Sealer if you wish to paint over.
Note1: GBS Penetrating Gloss Sealer will not harm glass, aluminum, metal, plants, or aquatic life. If GBS Penetrating Gloss Sealer gets on glass, rinse off so it doesn't dry.
Note2: GBS Penetrating Gloss Sealer will make the surface smoother and easier to clean but it can become slippery if wet.
Surface or Product Preparation
Always test GBS Penetrating Sealer in a small inconspicuous location first. When in doubt, call us at 800-405-0222.
FOUR Surface Requirements BEFORE Applying:
4) Neutral pH
I - POROUS
Porous means it should be able to soak in easily. If there are sealers, paint or adhesives on the surface they will disallow absorption. If the surface has been power-troweled it will also make the surface so dense that water will not soak in easily.
How to Test? Place a few drops of water onto the surface and see if it beads up or soaks in. If it soaks in and darkens, then the surface is porous and GBS Penetrating Sealer will also soak in. Nothing need be done except to make sure it is clean, dry and have a neutral pH. See #2 and #3 below.
If, however it beads up and does not soak in for about an hour, then there is either something on the surface or it has been power-troweled.
If power troweled, use our GBS MicroEtch product to open the pores without toxic chemicals. Do NOT acid etch. Or you can grind with a surface grinder that can be rented from most rental stores.
If there is latex paint, adhesives, or other acrylic sealers on the surface we recommend our GBS Industrial Strength Cleaner (If it is unknown what type of sealer was used, we recommend purchasing a test sample of the cleaner as some sealers cannot be chemically removed).
If efflorescence (white powder), rust stains, red clay stains appear on the surface, use a non-toxic acidic cleaner (Outdoor use only).
If mold, mildew or algae, then we recommend our GBS Mold, Mildew and Algae Cleaner. (For outdoor use only).
II - CLEAN
Clean means washed with a neutral pH detergent and then dried thoroughly. Ideally use a 3000 psi pressure washer. If you are indoors, this may be difficult so use a damp mop instead. If you have used a cleaner mentioned above or any other strong cleaner you should wash at least twice and rinse at least three times. Then dry well for several days.
III - DRY
After cleaning, use fans, heat, open windows or a shop vac to remove all water. If there is any water inside the concrete, it will prevent the sealer from soaking in. If it's humid, cold or damp, this could take longer to dry out. Be patient. Even if it appears dry on the surface, moisture may still be inside the concrete. Use a moisture meter to test or wait at least two days during warm weather or three days during cool weather.
NOTE: New concrete, even though appearing dry, is still very wet inside. Therefore, you should wait a minimum of 3-4 weeks until it has dried inside. This can be accelerated with heat, fans and good ventilation.
IV - NEUTRAL pH
New concrete has a high pH. For GBS Penetrating Sealer to work properly, the concrete needs to be in the pH 7-9 range to work well. No higher, no lower.
We provide litmus paper so you can test in several areas. Be sure to use distilled water with the litmus test.
What to do if the pH is still high after testing? Concrete less than one year old is often still high in pH. If so, you can use our GBS pH Reducer. This will bring the pH down to acceptable levels with a few hours. Then it should be washed off as explained in #2 above. Note: If you need to open the pores due to power troweled surface then our GBS Micro Etch product is sufficient. You don't need both products.
- OTHER LIMITATIONS -
Apply in good weather when air and surface temperature are above 45°F. and surface temperature is at least 5°F. above the Dew Point. For optimum application properties, materials should be between 70-90°F prior to application. Maintain unused material in closed containers in protected storage at 40-90°F out of direct sunlight. GBS Penetrating Gloss Sealer is not intended to be used submerged in water for an extended period of time. GBS Penetrating Gloss Sealer will not work in conjunction with thinset. The sealer seals the pores of the concrete, thus not leaving anything for the thinset to bond to. GBS Penetrating Gloss Sealer will not work for garages or driveways due to hot tire pick-up.
If the surface does NOT absorb water, then there is possibly another sealer applied to the surface and GBS Penetrating Sealer should not be applied.
Appearance When Dry
Cleans Up With
Store in cool dry place out of sunlight
Recycling or Disposal
Dispose of excess product in accordance with all local state and federal regulations, Do not throw out container unless completely empty. Pour contents onto dry cardboard and let thoroughly dry outdoors. May also be absorbed with cat litter sand or other dry materials