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Internet #206560102

Model #301239

1 gal. Moisture Stop (4-Pack)

  • Use before RockSolid, EpoxyShield or any floor paint/garage paint
  • Apply to uncoated concrete to create a barrier against moisture
  • Creates a vapor barrier to protects interior or exterior concrete
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How to Get It

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Product Overview

Rust-Oleum 1 Gal. Moisture Stop penetrates deep into the concrete. Penetrates to fill the pores of concrete and chemically reacts with the minerals forming a silicate mineral. Prevents salt damage, radon gas and moisture while retaining the look of natural concrete.
  • Use on previously uncoated concrete prior to coating
  • 1 Gal. covers up to 200 sq. ft.
  • Fills and densities pores of concrete to create a vapor barrier for moisture
  • Prevents damage from water, salt or radon gas
  • Bonds and seals concrete floors without changing the look
  • Apply to concrete and allow to penetrate surface for 45 minutes
  • Wait 2 hours then flush surface
  • Use prior to coating concrete to prevent moisture from coming through floors
  • Universal, for use with all concrete coatings, including EpoxyShield and RockSolid
  • See label for complete instructions

Additional Resources

From the Manufacturer

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BrandRust-OleumRust-OleumInsl-XRust-Oleum EpoxyShield
Name1 gal. Moisture Stop (4-Pack)1 gal. Clear Shimmer Concrete and Floor Top Coat (2-Pack)GarageGuard 1 gal. Semi-Gloss Gray Water-Based Waterborne Epoxy Floor Coat Kit240 oz. Gray High-Gloss 2.5-Car Garage Floor Kit
Container Size1 Gallon1 Gallon1 Gallon240 Ounce
Paint/Stain FeaturesWaterproofChemical Resistant,Prevents hot tire pickup,UV/Fade ResistantAbrasion Resistant,Chemical Resistant,High Foot Traffic,Prevents hot tire pickup,UV/Fade Resistant,WashableChemical Resistant,Prevents hot tire pickup,Waterproof
Coverage Area (sq. ft.)200 ft²250 ft²300 ft²500 ft²
Base MaterialLatexWater BasedEpoxyEpoxy
Substrate/Surface Usage TypeBrick,Concrete,StoneBrick,Concrete,StoneConcreteBrick,Concrete,Stone
SheenLow LustreGlossSemi-GlossHigh-Gloss
Surface LocationBasement Floor,Basement Wall,Driveway,Exterior Wall,Garage Floor,Garage Wall,PatioBasement Floor,Driveway,Garage Floor,PatioBasement Floor,Garage FloorBasement Floor,Garage Floor
Epoxy Type 2 Part Epoxy
View ProductView ProductView ProductView Product



Container Size
1 Gallon
Coverage Area (sq. ft.)
200 ft²


Application Method
Paint Sprayer
Base Material
Color Family
Dry To Touch Time (hh:mm)
Maximum Optimal Temperature (F)
Minimum Optimal Temperature (F)
Number per Package
Paint/Stain Clean Up
Soap & Water
Paint/Stain Features
Paint/Stain/Waterproofer Product Type
Concrete Basement & Garage
Recommended Number of Coats
Low Lustre
Stain & Sealer In One
Substrate/Surface Usage Type
Surface Location
Basement Floor,Basement Wall,Driveway,Exterior Wall,Garage Floor,Garage Wall,Patio
Time before recoating (hours)
Vertical / Horizontal

Warranty / Certifications

Manufacturer Warranty
Satisfaction guaranteed for full refund of purchase price

Questions & Answers

Typical questions asked about products:

  • Is the product durable?
  • Is the product easy to use?
  • What are the dimensions of the product?

Customer Reviews

  • 4.4
    out of 28 reviews
  • 100%recommend this product
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Showing 1-10 of 28 reviews
Be Prepared or Hire a Professional
This product is supposed to stop moisture from seeping through your concrete floor (or wall) in the event there is no vapor barrier, or it has failed, on the other side of the concrete. I am 50% confident that it might have done that job, so I would tell you to try it, only if you have no other options. (We get moisture in the Summer, so I can't currently test) The instructions and warnings are incomplete and inaccurate. The instructions say the product can easily be cleaned up with soap and water. This is false. After the product has dried, which it did following the instructions exactly, you need to mechanically remove the dried product using a wire brush or grinder. It was easy to use excess product or to splash it around on unintended targets as the instructions indicate to "completely saturate the floor" and "work it around" with no warning about splashing it about or stepping in it. After application, the instructions indicate a waiting period of a minimum of two hours before rinsing the product off. The instructions also threaten that if you fail to rinse off the product, after waiting at least the two hours, "effloressence" will appear, and you will have to buy Rust-Oleum Efflorescense remover. (Which is a set of processes of applying and rinsing to be sure this new "remove the product you just put down" stuff is removed properly. Instead, as you will note, I chose to wire brush and grind it off to be certain.) Effloresence is caused by water-soluble salts that seep out of concrete. So even if it did appear, as they say, soap and water should clean this up as well, right? Wrong. In my case, this was not effloressence at all, but leftover, unrinsable, un-scrubbable Rust-Oleum Moisture Stop. (Water and vinegar solution was also suggested many places online as an easy way to remove effloressence. Vinegar solution was attempted but was ineffective - to my mind proving the residue was not actually the water-soluble salts.) See attached photo of where I stepped on a previously sealed and painted area of my basement, this dried in under the two hours to a white footprint. The footprint, as well as several others like it, had been scrubbed and rinsed and shop vacuumed several times with soap, water, and vinegar solution before the photo. Watch out where you step or splash product! The shoe print is not from effloressence that has flowered out of the sealed concrete, it is leftover rustoleum product (the concrete there is sealed already). See attached photo of white chalky haze that comes right back after scrubbing with a deck brush, soap, water and vinegar, rinsing several times and removing water with shop vac. The directions were followed completely. In the end I had to spend about 10 hours over two days scrubbing and grinding the product off my basement floor. Not to mention the time wasted by attempting to "rinse" off the product with water, as directed by the instructions. Maybe instead the instructions should say to wait "no more than two hours" instead of "wait at least two hours" before rinsing??? If you use this product. Use it sparingly and in concentrated areas. Avoid stepping in it, or letting it run onto ANY other areas. Be prepared for some removal process. *I failed to include a photo of the treated concrete with the excess product left over, I did have to wire brush the whole floor, grinding/sanding some spots, and had to remove excess product from these areas as well, that had not been previously sealed. THIS IS NOT A PRODUCT FOR A DO-IT YOURSELF-ER UNLESS YOU DO NOT MIND POTENTIAL HOURS OF WIRE BRUSHING AND/OR GRINDING!
Response from Rust-OleumSupportNov 25, 2019
Let's talk about this! Rust-Oleum Moisture Stop is intended for use on bare and unsealed concrete and masonry surfaces only. Applying to sealed concrete will prevent the product from properly penetrating and not cause the intended reaction. After working the product on the surface, a hose or sprayer needs to be used to mist the surface to ensure it remains wet for 30-45 minutes. After 45 minutes, squeegee or broom the excess moisture from the surface. After 2 hours the surface is ready to be rinsed. Proper rinsing is essential to ensure that no efflorescence appears on the surface. If needing further assistance, please give us a call at 888-683-5667 to talk with us.
- Rust-Oleum Product Support 3 Rustoleum
  • DIY
  • Recommended
yay it works!
love this product finally something that works old basement was very humid never got water but it was always damp feeling. now even after heavy rains feels dry don't need to run the dehumidifier in the basement anymore.easy to apply however flooding the basement with water after application is a bit difficult. indoors I just left it white and looks marvelous. almost looks like a marble floor. had planned on painting over top of it but think it looks great just as it isjust use a garden sprayer missted water on it.then use a scrub brush and a Shop-Vac and got up the residue.so nice to be able to wear stocking feet in my basement.love the fact that it's non-toxic not you me was able to do it inside in the winter.had respirators gloves and goggles already went up taking them off cuz it was fine.
    • Recommended
    2 found this review helpful
    Easy to apply
    This product comes in a sturdy jug - it is well constructed to not leak. The lid has a large mouth, so it is easy to pour without splashing. The lid seals tightly. The product has low odor and dissipates quickly. The product has about the consistency of water and brushes easily to coat the surface. It is clear and does not add a gloss to the surface. I applied at about 60 degrees F, the product was dry within an hour. Although the product did not seem very hydrophobic when I sprayed it with a hose after it dried, I am hopeful it will serve its intended purpose.
    • Recommended
    Excellent sealer
    I used this Rust-Oleum moisture stop, to seal the floor of my garage. My floor is very old and pock marked, so it holds water puddles which eventually soak in. I first broomed out the garage, then I used my leaf blower to get all the fine dust out. I pored out smaller amounts of sealer onto the floor and then broomed it around, until the entire area was done, I could see a difference right away. The sealer brought a shine to the floor as it was going on, After it dried you could still see the shiny surface. A few days later when I put the wet car in the garage, the water puddled up on the surface and didn't soak in. I am well pleased with this product and am recommending it to my friends. Two gallons was enough to do my 2 stall garage.
    • Recommended
    2 found this review helpful
    Rust-Oleum Moisture Stop
    This product is what I needed at my aging cottage on the lake! The basement of my lakehouse has many floor cracks which allows water to seep into the basement when it rains. I tried this product out to see if it would seal the cracks. Prep work needs to be done ahead of time. Clean the floors thoroughly and use a wet-vac to get up all water and debris. Put on safety glasses and, using a low pressure sprayer, saturate floors and/or cinder block walls. As it begins to dry, make sure you wet it down (using the low pressure sprayer) every 15 minutes just so it stays wet for 45 minutes. The instructions on the bottle are pretty clear. You may get areas that look like dried salt patches so just rinse those areas really well again. Waiting too long will require a separate product to remove the salty appearance. Two days after applying this, we had a heavy rain and I was pleased to see that I did not get water coming through the many cracks in the basement floor that I previously had.
    • Recommended
    4 found this review helpful
    My 50 year old garage floor was stained, cracked, pitted,...
    My 50 year old garage floor was stained, cracked, pitted, and leaked up moisture after rains, and any time an impermeable plastic tub was set down overnight it was wet underneath - this fixed it along with patch and coatings
      My shop floor was poured without a vapor barrier laid...
      My shop floor was poured without a vapor barrier laid underneath. Even after two years of "hoping it would totally cure" I knew that paint would not stick. I followed all directions and treated the floor with "Clean & Etch", Moisture Stop, then Epoxy Paint. I have tested the floor and there is no more moisture coming up from underneath so I am happy.
      • Verified Purchase
      Seems to stop moisture but winter will be the big...
      Seems to stop moisture but winter will be the big test
      Response from Rust-OleumSupportAug 4, 2020
      Thanks for the feedback. Rust-Oleum Moisture Stop Fortifying Sealer penetrates into concrete and reacts with the free calcium and water to form a gel in cracks, pores and capillaries to protect against the ingress of water and contaminants. Moisture Stop prevents moisture from coming through concrete floors.
      - Rust-Oleum Product Support 6 Rustoleum
      • Verified Purchase
      Follow direction for preparing surface prior to application. You will...
      Follow direction for preparing surface prior to application. You will be happy when you do! Coverage spec is exact, so purchase enough first time. Application was easy, used 2” chip brush for edges and corners. Rubber squeegee for rest of area. Rinse well, follow directions, ready to paint when dry (<3 hr. after application.) Paint adhered evenly to sealed concrete.
      • Verified Purchase
      1 found this review helpful
      5 Star Review
      Rating provided by a verified purchaser
      • Verified Purchase
      Showing 1-10 of 28 reviews