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💡 Did you know? 1 Pint covers up to:
* Based on 2 Coats. Coverage may vary based on surface porosity and application method.
SEMCO Liquid Membrane™ Waterproofing
Semi-Clear / 1 Pint
3620 W Reno Avenue
3620 W Reno Avenue
Las Vegas NV 89118
United States
How to use this product
WATERPROOFING MADE EASY - PROFESSIONAL-GRADE MEMBRANE MADE AFFORDABLE AT ONLY $0.43 / sq ft ON A 5 GALLON PAIL.
The SEMCO Liquid Membrane™️ is a versatile, ready-to-use waterproofing and anti-fracture solution, combining COAT|COLOR|SEAL in one powerful product. Perfect for both indoor and outdoor use, this high-performance membrane is ideal for foundations, ICFs, basements, shower liners, deck and fence posts, planter boxes, and more. It adheres seamlessly to metal, wood, concrete, and various other surfaces, providing reliable waterproofing and superior protection. Free from solvents, non-toxic, and VOC-free, SEMCO Liquid Membrane™️ boasts a unique hybrid elastomer blend that ensures effortless application, excellent bridging, and outstanding waterproofing performance. Trust SEMCO for lasting protection in any environment.


- Ready to use waterproofing and crack-bridging membrane
- Coverage : covers up to 250 sq ft /gallon @ 2 coats (20mil each). Coverage may vary depending on porosity of the substrate.
- Easy to apply : with 1/2" woven nap roller, spray application or brush
- Application Areas:
- Concrete, Below Grade Foundation
- Basement Wall Waterproofing
- Basement Waterproofing
- Exterior Waterproofing
- Waterproof Sealer For Wood
- Wood
- Fiberglass Pools, Concrete Pools
- Stone
- Tiles
- Interior&Exterior Cladding
- Metal & Aluminium
- Drywall Boards, Sheetrock, Cement Board
- ICF Blocks
- Roof Shingles, Asphalt Shingles


Choose your Color, Apply and Waterproof
Here are the available colors of the SEMCO Liquid Membrane™️ - All colors are UV-stable


What is the coverage of SEMCO Liquid Membrane™️?
What is the cost of SEMCO Liquid Membrane™️?
Can tile be applied on top of SEMCO Liquid Membrane™️?
Can one paint over SEMCO Liquid Membrane™️?
How to apply SEMCO Liquid Membrane™️?
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Natural Wood
If you have any wax or existing coating we recommend using SEMCO Power Cleaner and Stone Soap to strip it off. • Or use 60 grit sandpaper to lightly sand the surface to take off any dirt or loose coating
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Pools, Ponds, submerged applications
Use SEMCO Nu-Lift Cleaner and Stone Soap to remove any mineral deposits or efflorescence • Remove any loose paint or coating
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Concrete, Cement, Block, Pavers, Synthetic Wood
Use SEMCO Nu-Lift Cleaner and Stone Soap to remove any mineral deposits or efflorescence • If there is any oil or grease, use SEMCO Power Cleaner and Nu-Lift Cleaner to strip surface of any oil or grease
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Metal, Aluminium
Use SEMCO Nu-Lift Cleaner and Stone Soap to chemically etc the surface of the metal for optimal bonding
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Petroleum based coating
Needs to be removed completely prior to application
- Surface Preparation
- Sweep all debris off surface to ensure proper bond. Clean up with water.
- Roller / Brush Application
- Use a 1/2" nap roller. Allow any pre-treated areas to dry to the touch. Apply a coat of Liquid Membrane(0.015 inches per coat) with brush or roller over substrate including pre-treated areas. Apply another coat of SEMCO Liquid Membrane™️ over the first coat of SEMCO Liquid Membrane™️. Let topcoat dry to the touch, approximately 1–2 hours at 70 °F (21 °C) and 50% RH. When last coat has dried to the touch, inspect final surface for pinholes, voids, thin spots or other defects. SEMCO Liquid Membrane™️ will dry to a lighter shade when it’s dry to touch. Use additional SEMCO Liquid Membrane™️ to seal the defects. Required thickness is 40 mil
- Sprayer Application
- The sprayer being used for the application of SEMCO Liquid Membrane™️ should be capable of producing a minimum of 2,500 psi (17.2), maximum of 3,300 psi (22.8 MPa) with a flow rate of 0.95 to 1.6 GPM (3.6 to 6.0 LPM) using a 0.521 or a 0.631 reversible tip. Keep the unit filled with SEMCO Liquid Membrane™️ to ensure continuous application of liquid. The hose length should not exceed 100’ (30 m) in length and 3/8” (9 mm) in diameter. Required thickness is 40 mil
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Additional Info
- For clean up use warm water to clean brush or roller right after use.
- For optimal bonding we highly recommend preparing the surface as mentioned above for best results.
- Stir up the product well before use in order to mix up the color pigments.
- Avoid application in direct sun light in the afternoon or temperatures of over 85F as it might cause the product to dry too fast before it can adhere to the substrate
- Suitable for light foot traffic.For heavy foot traffic or vehicle traffic, we recommend using SEMCO Titan Shield.
- It can not be applied to wet substrates or substrates still containing moisture, else it will not cure correctly and stay tacky. Max. rest moisture in substrate can be up to 3%. If you are unsure about the moisture content, have it measured prior to application.
- For applications where the product is fully submerged, 3 coats @20mil each is required and allow a curing time of minimum 6-7 days.Also application must coat entire surface to above the waterline including tiles. If tiles cannot be coated or you would like to retain its look, use Natural Shield to seal off all grouts.
- Application on non porous surfaces such as metal or fiberglass : Apply thin coats as this will allow for the product to cure faster.
- Cure times are displayed in our curing chart. However if coats have been applied too thick, the surface might feel tacky. This is a sign of trapped moisture. If you have left over product, apply a very thin coat over the entire surface. The surface needs to be fully cured and hard before being fully submerged.
- For applications where SEMCO Liquid Membrane is applied on pool plaster, extended curing times might occur as plaster holds more moisture which needs to breath out first. A slight color change may occur when being in contact with water when the product has not fully cured yet. This however will not affect the performance of the SEMCO Liquid Membrane.
Why does my SEMCO Liquid Membrane™️ discolor when getting in contact with water?
What if I have already filled the pool/fountain or pond with water?
FOR STEP-BY-STEP GUIDES SPECIFIC TO YOUR PROJECT
Preparation
Sand the wood surface with a 60 grit sandpaper. Take off any loose coating and ensure surface is free of any debris
Masking
Mask off areas that are not receiving any coating. Remove masking tape before material has fully cured.
APPLYING COAT
Use a 1/2" nap roller. Allow any pre-treated areas to fully dry. Apply a thin coat (0.015 inch per coat) of SEMCO Liquid Membrane™ with brush or roller over substrate including pre-treated areas. Once you can walk on the surface and not get any residue on your shoe or feet or cannot leave a fingerprint impression it is ready to re-coat. Apply another thin coat of SEMCO Liquid Membrane™ in an alternate direction over the first coat of SEMCO Liquid Membrane™. Let topcoat dry to the touch, approximately 1–2 hours at 70 °F (21 °C) and 50% RH. When last coat has dried to the touch, inspect final surface for pinholes, voids, thin spots or other defects.SEMCO Liquid Membrane™ will dry to a lighter color when it’s dry to touch. Use additional SEMCO Liquid Membrane™ to seal the defects. Required total thickness is 0.03 - 0.04 inches for non submerged applications.
Curing Time
Curing time depends on temperature, humidity and airflow, however typically initial cure is within 6 - 7 days as per specific product recommendations.
Additional Information
• For clean up use warm water to clean brush or roller right after use.
• For optimal bonding we highly recommend preparing the surface as mentioned above for best results.
• Stir up the product well before use in order to mix up the color pigments.
• Avoid application in direct sun light in the afternoon or temperatures of over 85F as it might cause the product to dry too fast before it can adhere to the substrate
• Suitable for light foot traffic.For heavy foot traffic or vehicle traffic, we recommend using SEMCO Titan Shield Gloss.
• It can not be applied to wet substrates or substrates still containing moisture, else it will not cure correctly and stay tacky. Max. rest moisture in substrate can be up to 3%. If you are unsure about the moisture content, have it measured prior to application.
• For applications where the product is fully submerged, 3 coats @20mil each is required and allow a curing time of minimum 6-7 days.Also application must coat entire surface to above the waterline.
• Application on non porous surfaces such as metal or fiberglass : Apply thin coats as this will allow for the product to cure faster.
• Cure times are displayed in our curing chart. However if coats have been applied too thick, the surface might feel tacky. This is a sign of trapped moisture. If you have left over product, apply a very thin coat over the entire surface. The surface needs to be fully cured and hard before permitting water.
• For applications where SEMCO Liquid Membrane™ is applied on pool plaster, extended curing times might occur as plaster holds more moisture which needs to breath out first. A slight color change may occur when being in contact with water when the product has not fully cured yet. This however will not affect the performance of the SEMCO Liquid Membrane™.
• It is always advisable to apply a small test patch in an inconspicuous are to ensure adequate adhesion prior to full application.
• If you have multiple containers of SEMCO Liquid Membrane™, we highly recommend to either mix them together or use one container for the last layer to get color consistency.
Need Assistance?
CALL OR EMAIL US AT: 1-833-211-2297 info@semcoworks.com