• DECO 20 Clear Penetrating Concrete Sealer 5 gal. (Shipping Incl.) - D205
  • DECO 20 Clear Penetrating Concrete Sealer 5 gal. (Shipping Incl.) - D205
  • DECO 20 Clear Penetrating Concrete Sealer 5 gal. (Shipping Incl.) - D205
  • DECO 20 Clear Penetrating Concrete Sealer 5 gal. (Shipping Incl.) - D205
  • DECO 20 Clear Penetrating Concrete Sealer 5 gal. (Shipping Incl.) - D205
  • DECO 20 Clear Penetrating Concrete Sealer 5 gal. (Shipping Incl.) - D205
  • DECO 20 Clear Penetrating Concrete Sealer 5 gal. (Shipping Incl.) - D205
Price: $195.00

    DECO 20 Clear Penetrating Sealer

    Deco’s first product, created in 1991, designed as a safe & easy to use multi-purpose concrete sealer. We’re proud to continually receive praise from customers by being 100% Water-Based and contain no solvents. It's an Eco-Friendly material with the viscosity similar to water. It is NON-SLIPPERY, NON-HAZARDOUS, NO SHEEN. It is Odorless and UV Resistant. Deco 20 has been applied in over 2 million International applications and is the only Clear Sealer approved by ICC for dampproofing foundation walls. 

    Deco 20 can be applied on the interior & exterior of foundation walls. This product is a direct replacement for tar/bituminous systems for below-grade dampproof applications. Deco 20 prevents moisture invasion and acts as a vapor barrier to keep walls dry.

    Applications: Foundation Walls (concrete, block, precast), Above & Below Grade, concrete buildings, driveways sidewalks, patios, crawl spaces, pools, any porous concrete vertical or horizontal surfaces.


    • Tested & Approved by ICC (International Code Council) to replace for bituminous/tar materials.
    • Eco-Friendly: Water Based & Non-Hazardous
    • UV Resistant & Application requires only (1) coat (be sure concrete is dry)
    • Paintable - Breathable - Odorless - Dries Clear - NON Slip when wet or dry - No sheen or glossy look!! 
    • Ready to Apply: No mixing, product ready of our container.  Any remaining product can be saved.
    • Applicable by: Garden or Airless sprayer ( >100psi )


    1. Block (parged & non-parged)
    2. Poured Concrete (must wait a min. of 1 full day for form oil to dissipate before applying)
    3. Precast


    Deco 20 can be applied and is classified by ICC (International Code Council) as a dampproof product below grade on exterior applications. It provides a highly effective & breathable moisture barrier, dries clear, and is paintable.

    While many materials only offer below grade dampproof protection, Deco 20 provides above & below grade wall protection. Compared to products like Tar and other bituminous materials, Deco 20 is not labor intensive. Tar & similar products are messy, involving mixing, brushing, or troweling onto the wall, which results in less coverage rates per gal. and longer application time.

    On arrival, Deco 20 is ready to use. Pour into your sprayer, this can be a weed or any airless/ hand pump sprayer, (be sure to clean before use) and apply 1 coat onto the wall. Typical dry time (variables include humidity, air flow, etc...) is 1-2hrs. Our customers continually tell us they love the ease of use and the time saved with this product.


    1. Block
    2. Stone (Must be limestone based)
    3. Concrete


    Deco 20 can be applied to walls that are continually damp or become damp after heavy rains or storms. If your foundation walls have water coming through them, Deco 20 WILL NOT stop the water from coming in, nor will any product on the market. At this point, call an excavator or basement specialist - the issue is on the exterior part of the wall(s). (Note: if you wish to have the exterior of your foundation wall(s) protected by a waterproof material check out our Deco Seal). Furthermore, if you have Drylok or any topical coating on the wall, it must be removed before applying Deco 20. Topical coatings sit on the surface they’re applied to and consistent moisture will cause them to eventually bubble, pop, or flake off. In our experience, topical coatings show efflorescence coming through them.

    A damp wall(s) must be dry as possible before applying Deco 20. Apply the concept of a sponge to your wall, the less water (in this case dampness) inside of it, the more Deco 20 it can absorb. Get air on the walls, set fans towards the wall, open windows until dry or best possible. Apply 1 heavy coat on the wall, no run downs are needed. Protect glass, metal, or anything else on your concrete surface. Read our Applicator Guidelines or your bucket for details.


    • Concrete: Driveways, Floor Slabs, Patios, Pool Areas, Sidewalks
    • Precast: Commercial Buildings, Parking Garages, Water tanks


    Deco 20 separates itself from most sealers because they don't have the durability and ICC approval for foundation walls. Our high rating by ICC allows Deco 20 to be used for non-foundation wall projects. You have the benefit of using an contractor grade sealer that will provide superior results.


    • Remove all dirt, dust, oils, efflorescence (white blotchy areas), foreign material which is to be sealed
    • Fill or repair any cracks, honeycomb, holes, etc. with Deco Tie Patch or concrete repair caulk/patch.
    • New Construction - Forms must be off wall 1 full day to allow surface to dry before applying Deco20
    • Pour Deco 20 into any sprayer and apply on surface with run downs showing wall is fully saturated. Apply no more than 100psi of pressure if using airless sprayer. 60-80psi pressure is best.
    • Drier the surface insures best results, 36-85 degrees otherwise cold or evaporation will affect coverage
    • Only 1 coat application
    • Perform test to insure desired results. NON-SLIPPERY, NON-HAZARDOUS - NON-TOXIC, BREATHABLE, PAINTABLE, NO SHEEN
    • Use proper safety glasses when spraying. Do not spray on windy day or threat of rain day within 4 hrs
    • Dries in several hours dependent on temperature, humidity. Dries clear, no wet look. Do not get on glass, asphalt, etc.. Wipe off glass immediately with wet cloth to prevent etching or water hose down affected areas such as driveways that are at base of vertical wall being sprayed. Drop cloth helpful.

    DECO 20 Technical Information

    ICC (International Code Council) Classification:

    • Dampproof - ICC-ES Legacy Report # 93-04.01
    • Waterproof above grade

    DECO Clear Penetrating Concrete Sealer (DECO 20) is:

    • Low VOC's (Volatile Organic Compounds) Meets all States Spec's.
    • UV Resistant, Paintable, Breathable
    • Water Based w/ Silicate Solids


    • ASTM D 2939 - Resistance to water solubility. Flexibility no cracking.
    • ASTM D 466 - Resistance to water flow and action. Excellent adhesion. No reemulsification.
    • ASTM E 96 - Water vapor transmission. - 0.04 grains/sq.ft./hour Water vapor permeability. - 0.102 perms
    • ASTM C 836 - Film Thickness On Vertical Surface. SS-W-110 C - Water Repellency On Masonry Test 1.925% Average
    • ASTM C 672 - Freeze/Thaw - 20 Day Cycle

    REPORTS (PDF's) - View on "Reports/Videos Tab"

    Coverage Rate

    Block = 125-150 sq/ft/gal. [ 5 gal. bucket = 750sq/ft]

    Concrete = 175-200 sq.ft/gal [ 5 gal. = 1000 sq.ft]

    Precast = 200+ sq/ft. gal. [ 5 gal. = 1000+ sq.ft]

    Coverage rates are dependent on temperatures, porosity of surface, sprayer/equipment, etc. 

    Exterior Wall...New Foundation Poured Concrete

    Interior Block Wall...

    Overall Customer Rating of 7 Reviews:
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    Impressive Deco 20 Results

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    Mark, I am so impressed with the product. We applied it after digging down to the footers. We had to let that last block dry out while we sprayed the entire 1344 sq ft of block. It was like magic. That material was so easy to apply. Typically in the area where my home is that I am building, the heavy wet dew would make the walls so wet. The morning after we sprayed it, we went outside and nothing, absolutely nothing was wet. My brother in law is an electrical contractor. He never saw a product like this before and was extremely impressed. We could not stop talking about how water beads up and rolls right off of the treated block.

    I know I will be painting over the block probably in the fall but I was so glad to get this part of the foundation completed.

    Again, amazing product and so so so satisfied with the results.

    Thank you
    Catherine Saldutti.

    New Castle, PA

    Exceeded Expectations

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    Austin & Mark,

    Yes you met and exceeded my expectations. I received it in one day and I appreciate your fast service.

    I just had the basement walls replaced and waterproofed. I wanted the same sealer that worked so well in stopping the leaks on the original walls. My concern was not so much for water intrusion since the waterproofing on the new walls is elastomeric versus the tar that the builder used in 2015. I also wanted a sealer that I can paint over for additional protection.

    The Deco 20 sealer applied quickly using the sprayer type that Mark recommended. I only applied one coat and used the entire can. I avoided the plastic pipes as instructed. The cleanup of the sprayer was easy. I had no problem with odor as advertised.

    I would rate the Deco 20 sealer a 5 and I would rate the customer service a 5.

    I did recommend your product to the engineers and the insurance adjustors that visited and also to the masonry contractor that replaced the walls. I was so impressed with the Deco 20 performance that I keep a photo of the can that was used by the original sealing contractor when he visited to stop the leaks caused by his tar waterproofing.

    Thanks for following up.


    Durham NC

    Rain Causing Interior Moisture

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    We have a block building and two of our walls had moisture inside when it rains hard. We were told Deco 20 Clear was the best product. We contracted an outside firm to spray the exterior walls with this Deco 20. Since then we've not had any issues with moisture and it's rained hard several times. This is an excellent product that we will be including in our MRO plan for our other facilities. We appreciate your technical help and fine product.

    Moody, AL

    New Construction Walls

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    I bought and applied the deco 20 to my new construction walls. I used (1) 5 gallon bucket and sprayed walls, the difference between the sprayed walls and retaining wall which is not sprayed is just like the video spraying the wall with water. The rain water beeds up and runs off. Very impressed with this product and will use it again. Zach Bryant

    Dayton, OH

    Concrete Driveway

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    We sprayed Deco 20 on our driveway about 4 years ago and noticed this summer the concrete looked wet or darker. I was hoping this product would have lasted 6 or 7 years but I was informed by Mark their salesman that driveways take a beating with foot and car traffic. We ordered 2 more pails and after powerwashing and putting on Deco it's beading more and isn't showing wet look after it rains. Yes I am recommending this product.

    Availability: In Stock
    Usually ships In Same Day
    Item #: D205