Frequently Asked Questions

We have a 30-day return policy, which means you have 30 days after receiving your order to request a return. To be eligible for a return, your item must be in the same condition that you received it and in its original packaging. You’ll also need the receipt or proof of purchase. We strongly recommend a shipping insurance with tracking on returns as we cannot refund damaged returns. Any returns past the 30 days cannot be accepted or will be refunded as a store credit.

To complete your return, we require a receipt or proof of purchase. Any return will be charged with a 25% restocking fee and we do not refund the shipping from the order. Any opened packages returned will be charged a 40% restocking fee. Products that are made by special order or have Extra Pigment in, cannot be returned. Any liquids can only be returned if unopened. Please contact customer support at info@semcoworks.com prior to returning the item.

International orders : Shipping fees for international orders are non-refundable. In the event that an order is returned to us due to customer refusal, failure to pay applicable duties or taxes, or the provision of an invalid or incomplete address, the customer will be responsible for all return shipping costs. Additionally, a restocking fee of 25% will be deducted from the refund amount. Refunds will be issued only after the returned merchandise has been received and inspected to confirm it is in acceptable condition.

Once we receive your item and went through inspection, a refund is initiated immediately. All major credit card providers generally take 5-7 business days to process your refund before it appears in your bank account.

The best way to change your order is to contact our support or simply give us a call during our business hours. If an order is shipped, we won't be able to make any changes to your order and you would need to place a new order.

Why does elasticity matter in waterproofing? SEMCO Liquid Membrane™ features an incredible 1300% elongation, meaning it can stretch up to 13 times its original length without breaking.

Why is this vital for your floor? Substrates naturally shift due to temperature changes and settling. A rigid coating would snap, causing cracks to telegraph through to your surface. Because SEMCO Liquid Membrane™ is a flexible fracture-resistant membrane, it "bridges" these cracks—stretching over the gap to keep your floor seamless and waterproof, even when the subfloor moves beneath it.

Yes, you can apply SEMCO Liquid Membrane™️ directly to bare cinderblock! Just follow these three easy steps to make sure it sticks perfectly:

Clean it first: We highly recommend scrubbing the wall with our cleaners. This gets rid of any stubborn dirt, hard water stains, or "efflorescence" (that chalky white powder that sometimes appears on brick).

Let it dry: Wait until the cinderblock is 100% dry. This is crucial for a good adhesion or bond.

Apply: Roll on at least 2 coats 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. For corrugated metal please calculate at least 33% extra material.

Yes, absolutely! Apply the SEMCO Liquid Membrane™️ as a primary waterproofing and apply tile over it with your mortar/thin-set.

Yes, absolutely! We recommend a urethane based or water based acrylic paint if you wish to paint over the SEMCO Liquid Membrane™️

1. 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

2. 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

3. 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

4. Metal, Aluminium

   Use SEMCO Nu-Lift Cleaner and Stone Soap to chemically etc the surface of the metal for optimal bonding

5. Petroleum based coating

   Needs to be removed completely prior to application

6. Surface Preparation
   • Sweep all debris off surface to ensure proper bond. Clean up with water.
7. Roller / Brush Application
   • Use a 1/2" nap roller. Allow any pre-treated areas to dry. Apply a coat of Liquid Membrane(0.015 inches per coat) with a roller over substrate including pre-treated areas.
   • Once the first coat is dry (test by pressing your thumb onto the surface and no imprint is visible), apply another coat of SEMCO Liquid Membrane™️ over the first coat. 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
8. 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
   • 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. This however will not affect the performance of the SEMCO Liquid Membrane.

Utilize Fabric Reinforcement to effectively bridge cracks within the substrate and to reinforce joints where different substrate materials intersect.
Also in showers or balconies, apply Fabric Reinforcement in corners and where the floor meets the wall.

How to apply Fabric Reinforcement

1. Apply a generous coat of SEMCO Liquid Membrane™ over the area where you are about to apply the Fabric Reinforcement.

2. While the SEMCO Liquid Membrane™ is still wet, apply the Fabric Reinforcement and press it flat. It is important to avoid any bubbles or  wrinkles.

3. Wait about 10-15 min and then apply a thin coat of SEMCO Liquid Membrane™ over the Fabric Reinforcement to encapsulate it. Do a finger imprint test on the surface, once you do not leave an imprint you can continue to apply SEMCO Liquid Membrane™ to the rest of the surface.

Yes, SEMCO Liquid Membrane™ requires a minimum of 3 coats or a total thickness of between 45-60 mils. Ensure that each coat is dry to the touch or doesn't leave any finger imprint before applying the next coat. Once finished, allow for a minimum of 6-7 days (depending on temperature and humidity) to fully cure before permitting water.

SEMCO Natural Shield can be applied to any porous surface like :

• Brick
• Natural Stone
• Grout
• Concrete

If the surface is painted or sealed, it is best remove the coating completely prior to applying SEMCO Natural Shield as it is a penetrating sealer.

Step 1: Surface Preparation

• Prepare the area using the appropriate method for your specific surface.

• Sweep away all loose dirt and debris.

• Ensure the surface is completely dry before beginning the application.

Step 2: Sealer Application

• Select your application tool: a 1/4” nap roller, an HVLP sprayer, a pump sprayer, or an airless sprayer (use a size 17 tip).

• Apply a minimum of three coats to ensure maximum performance and protection.

• Apply subsequent coats wet-on-wet: Do not allow the sealer to dry between the first, second, and third coats.

• Spread the product evenly and do not allow the sealer to pool or puddle.

• Apply additional coats if necessary, as highly porous surfaces (such as raw concrete or block) will likely require more than three coats for full coverage.

Achieve a durable, professional-grade matte finish by following these step-by-step application instructions for SEMCO Sealer MATTE. Whether you are sealing standard floors, vertical walls, or wet areas like showers, proper preparation and application are critical for a long-lasting result.

Quick Reference Specifications

• Optimal Surface pH: 6.8 – 7.8

• Minimum Coats Required: 2 coats (3 coats required for wet areas)

• Target Total Film Thickness: 6 – 8 mils

• Airless Sprayer Settings: Tip size 17 at 850 – 1,000 PSI

• Roller Type: 1/4” woven short nap roller

• Wet Area Cure Time: 72 hours before water exposure

Step 1: Surface Preparation & pH Testing

Proper prep ensures maximum adhesion and optimal performance of the sealer.

1. Prepare the Surface: Execute the appropriate preparation method for your specific substrate.

2. Test the pH Level: Before applying the sealer, test the surface pH. The optimal pH level for application is between 6.8 and 7.8. Do not proceed until the surface falls within this range.

Step 2: Floor & Horizontal Surface Application

To achieve the required 6 to 8 mils total film thickness, you must apply a minimum of 2 coats. Choose one of the following application methods:

Primary Method: Airless Sprayer (Recommended)

• Equip your airless sprayer with a size 17 tip.

• Set the pressure between 850 and 1,000 PSI.

• Maintain a consistent distance by positioning the sprayer gun exactly 18 inches away from the floor while spraying.

Alternative Method: Roller or Trowel

• Apply the product using a Magic Trowel or a 1/4” woven short nap roller.

• Crucial Technique: Apply in a single direction. Do not roll back and forth, as this can introduce bubbles or uneven textures into the matte finish.

Application Guidelines for Vertical Surfaces

Applying SEMCO Sealer MATTE to walls and vertical surfaces requires techniques that prevent running and ensure an even coat. A minimum of 2 coats is required.

• Standard Vertical Application: Use a 1/4” woven nap roller to apply the sealer, followed immediately by a Magic Trowel to spread it evenly. Always work strictly from top to bottom.

• Large Vertical Areas: For maximum efficiency on expansive vertical surfaces, use an HVLP (High Volume Low Pressure) sprayer equipped with a large size 17 tip.

Special Instructions for Wet Areas (Showers, Bathrooms, etc.)

When applying SEMCO Sealer MATTE in environments exposed to moisture, strict adherence to these enhanced guidelines is mandatory for waterproofing success:

• Increased Coating: Apply a minimum of 3 coats (instead of the standard 2).

• Extended Cure Time: Allow the final coat to fully cure for a minimum of 72 hours prior to permitting any water contact.

Achieve a durable, professional-grade finish by following these step-by-step application instructions for Titan Shield Gloss. Whether you are coating horizontal floors or vertical surfaces, proper surface preparation and application techniques are critical for long-lasting results.

Quick Reference Specifications

• Optimal Surface pH: 6.8 – 7.8

• Minimum Coats Required: 3 coats

• Target Total Film Thickness: 6 – 8 mils

• Airless Sprayer Settings: Tip size 17 at 850 – 1,000 PSI

• Roller Type: 1/4” woven short nap roller

Step 1: Surface Preparation & pH Testing

Proper prep ensures maximum adhesion and product longevity.

1. Prepare the Surface: Execute the appropriate preparation method for your specific substrate.

2. Test the pH Level: Before applying the coating, test the surface pH. The optimal pH level for application is between 6.8 and 7.8. Do not proceed until the surface falls within this range.

Step 2: Floor & Horizontal Surface Application

To achieve the required 6 to 8 mils total film thickness, you must apply a minimum of 3 coats. Choose one of the following application methods:

Primary Method: Airless Sprayer (Recommended)

• Equip your airless sprayer with a size 17 tip.

• Set the pressure between 850 and 1,000 PSI.

• Maintain a consistent distance by positioning the sprayer gun exactly 18 inches away from the floor while spraying.

Alternative Method: Roller or Trowel

• Apply the product using a Magic Trowel or a 1/4” woven short nap roller.

• Crucial Technique: Apply in a single direction. Do not roll back and forth, as this can introduce bubbles or uneven textures.

Application Guidelines for Vertical Surfaces

Applying Titan Shield Gloss to walls and vertical surfaces requires slight modifications to prevent running and ensure an even coat. A minimum of 3 coats is still required.

• Standard Vertical Application: Use a 1/4” woven nap roller to apply the coating, followed immediately by a Magic Trowel to spread it evenly. Always work strictly from top to bottom.

• Large Vertical Areas: For maximum efficiency on expansive vertical surfaces, use an HVLP (High Volume Low Pressure) sprayer equipped with a large size 17 tip.

Orders are processed in the order we receive them unless you've chosen expedited shipping. Any orders that come in before 8:00am PST Monday to Friday will be processed and sent out the same day. For any orders that come in after 8:00am PST will be processed and shipped out the next day. Orders on the weekend will be shipped out the following Monday.

All our packages will be shipped out from our Las Vegas,NV location. Depending on where you are located, your package should be with you within 3-5 business days unless an expedited shipping option was chosen at checkout.

Chances of receiving defective item is very rare but it could happen. Please take pictures of the product which shows defect clearly & contact our support to check if it's eligible for replacement. Feel free to email us to info@semcoworks.com or use our live chat on our website.