1
Negative-side waterproofing is the application of a coating material to the interior or the 'dry' side of a foundation or wall. Its primary function is to create a barrier coat to stop water from leaking through the wall and keeping the space dry. We offer the perfect solution with SEMCO Liquid Membrane™️!
![color chart]()
Due to Computer Monitors, Colors may not be exactly as shown. For applications which are fully submerged in water or in contact with water over an extended period of time, we do recommend adding EXTRA PIGMENT and not using semi-clear.
About
WATERPROOFING MADE EASY - PROFESSIONAL-GRADE MEMBRANE MADE AFFORDABLE AT ONLY $0.39 / sq ft ON A 5 GALLON PAIL.
The SEMCO Liquid Membrane™️ is a ready to use COAT|COLOR|SEAL waterproofing and anti-fracture membrane in ONE. Its hybrid elastomer blend enables easy application while providing excellent bridging, and waterproofing capabilities.
Negative-side waterproofing is the application of a coating material to the interior or the 'dry' side of a foundation or wall. Its primary function is to create a barrier coat to stop water from leaking through the wall and keeping the space dry. We offer the perfect solution with SEMCO Liquid Membrane™️!
THE SOLUTION
Benefits
- Ready to use waterproofing and crack-bridging membrane
- Coverage : 200 - 250 sq ft /gallon @ 2 coats (20mil each)
- Easy to apply : with 1/2" woven nap roller, spray application or brush
- Substrates:
- Concrete, Below Grade Foundation
- Wood
- Fiberglass Pools, Concrete Pools
- Stone
- Tiles
- Interior&Exterior Cladding
- Metal & Aluminium
- Drywall Boards, Sheetrock, Cement Board
- ICF Blocks
- Roof Shingles, Asphalt Shingles
- UV-Stable : Suitable for exterior applications
Liquid Membrane Colors
Choose your Color, Apply and Waterproof
Here are the available colors of the SEMCO Liquid Membrane™️ - All colors are UV-stable
Due to Computer Monitors, Colors may not be exactly as shown. For applications which are fully submerged in water or in contact with water over an extended period of time, we do recommend adding EXTRA PIGMENT and not using semi-clear.
FAQ
What is the coverage of SEMCO Liquid Membrane™️?
The coverage of the SEMCO Liquid Membrane™️ is approx. 200 - 250 sq ft per gallon at 2 coats(20mil each coat). For fully submerged or below grade applications we recommend 3 coats and the coverage is then 100 - 150 sq ft per gallon. Coverage may vary depending on porosity of the substrate.
What is the cost of SEMCO Liquid Membrane™️?
1 gallon of SEMCO Liquid Membrane™️ costs $99.50 and has a coverage of 200 - 250 sq ft for 2 coats. Let's break it down to the low end of the coverage and it would work you out to only $0.39 per square foot
Can tile be applied on top of SEMCO Liquid Membrane™️?
Yes, absolutely! You can apply the SEMCO Liquid Membrane™️ on your substrate, apply the SEMCO Liquid Membrane™️ as a primary waterproofing and apply tile over it with your mortar/thin-set.
Can one paint over SEMCO Liquid Membrane™️?
Yes, absolutely! We recommend a urethane based or water based acrylic paint if you wish to paint over the SEMCO Liquid Membrane™️
How to apply SEMCO Liquid Membrane™️?
-
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
-
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
-
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
-
Metal, Aluminium
Use SEMCO Nu-Lift Cleaner and Stone Soap to chemically etc the surface of the metal for optimal bonding
-
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
-
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
- 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.
Drying / Cure Times
Drying Times
![Liquid Membrane Drying and Recoat times]()
Curing Times
![Liquid Membrane Cure Times]()
Curing Times
SEMCO Liquid Membrane™
- Regular price
- $29.90
- Sale price
- $25.90
📦Free Shipping on orders over $100
EASY TO APPLY PROFESSIONAL-GRADE WATERPROOFING
Forms a continuous waterproofing barrier with exceptional adhesion and reduces crack transmission for all surfaces.
- Can be applied on Concrete, Wood, Stone, Tiles, Interior&Exterior Cladding, Metal&Aluminium, Drywall boards, ICF blocks, RV Roofs
- Safe for fish, plant produce and saltwater use
- For Interior, exterior, fully submerged in water and below grade applications
- Easy application with roller, brush or airless sprayer
- 5 year standard limited warranty, 10 year for non-traffic surfaces
1
Negative-side waterproofing is the application of a coating material to the interior or the 'dry' side of a foundation or wall. Its primary function is to create a barrier coat to stop water from leaking through the wall and keeping the space dry. We offer the perfect solution with SEMCO Liquid Membrane™️!
Due to Computer Monitors, Colors may not be exactly as shown. For applications which are fully submerged in water or in contact with water over an extended period of time, we do recommend adding EXTRA PIGMENT and not using semi-clear.
About
WATERPROOFING MADE EASY - PROFESSIONAL-GRADE MEMBRANE MADE AFFORDABLE AT ONLY $0.39 / sq ft ON A 5 GALLON PAIL.
The SEMCO Liquid Membrane™️ is a ready to use COAT|COLOR|SEAL waterproofing and anti-fracture membrane in ONE. Its hybrid elastomer blend enables easy application while providing excellent bridging, and waterproofing capabilities.
Negative-side waterproofing is the application of a coating material to the interior or the 'dry' side of a foundation or wall. Its primary function is to create a barrier coat to stop water from leaking through the wall and keeping the space dry. We offer the perfect solution with SEMCO Liquid Membrane™️!
THE SOLUTION
Benefits
- Ready to use waterproofing and crack-bridging membrane
- Coverage : 200 - 250 sq ft /gallon @ 2 coats (20mil each)
- Easy to apply : with 1/2" woven nap roller, spray application or brush
- Substrates:
- Concrete, Below Grade Foundation
- Wood
- Fiberglass Pools, Concrete Pools
- Stone
- Tiles
- Interior&Exterior Cladding
- Metal & Aluminium
- Drywall Boards, Sheetrock, Cement Board
- ICF Blocks
- Roof Shingles, Asphalt Shingles
- UV-Stable : Suitable for exterior applications
Liquid Membrane Colors
Choose your Color, Apply and Waterproof
Here are the available colors of the SEMCO Liquid Membrane™️ - All colors are UV-stable
Due to Computer Monitors, Colors may not be exactly as shown. For applications which are fully submerged in water or in contact with water over an extended period of time, we do recommend adding EXTRA PIGMENT and not using semi-clear.
FAQ
What is the coverage of SEMCO Liquid Membrane™️?
The coverage of the SEMCO Liquid Membrane™️ is approx. 200 - 250 sq ft per gallon at 2 coats(20mil each coat). For fully submerged or below grade applications we recommend 3 coats and the coverage is then 100 - 150 sq ft per gallon. Coverage may vary depending on porosity of the substrate.
What is the cost of SEMCO Liquid Membrane™️?
1 gallon of SEMCO Liquid Membrane™️ costs $99.50 and has a coverage of 200 - 250 sq ft for 2 coats. Let's break it down to the low end of the coverage and it would work you out to only $0.39 per square foot
Can tile be applied on top of SEMCO Liquid Membrane™️?
Yes, absolutely! You can apply the SEMCO Liquid Membrane™️ on your substrate, apply the SEMCO Liquid Membrane™️ as a primary waterproofing and apply tile over it with your mortar/thin-set.
Can one paint over SEMCO Liquid Membrane™️?
Yes, absolutely! We recommend a urethane based or water based acrylic paint if you wish to paint over the SEMCO Liquid Membrane™️
How to apply SEMCO Liquid Membrane™️?
-
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
-
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
-
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
-
Metal, Aluminium
Use SEMCO Nu-Lift Cleaner and Stone Soap to chemically etc the surface of the metal for optimal bonding
-
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
-
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
- 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.
Drying / Cure Times
Drying Times
Curing Times
Curing Times
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