Penetrating Densifier & Hardener Sila-Tek™ 3500
Our cost-effective, all-in-one primer, densifier and sodium-based hardener. Available in an industry leading, concentrated formula that mixes with water to makes 5 gallons.
This cost-effective sodium-based densifier is often used before polishing concrete. It also works well as a primer to strengthen and harden concrete and increase the performance of a sealer. When used as a primer it increases adhesion of a top coat sealer up to 25%.
Easily applied with a sprayer, roller or brush, the 3500 can be used on a variety of poured concrete substrates. Can be used indoors and outdoors but a sealer is recommended to be used in conjunction if concrete will not be polished. A popular choice to prime and harden new and old concrete.
Provides a flat, natural finish. Treated concrete will not change in appearance, color or texture unless concrete is polished. This dual-function product is mixed with water prior to application and dries within a few hours of application. Once a densifier has been used, you do not need to retreat concrete in the future. Often used prior to polishing concrete to achieve a glossy finish.
Application - Primer
Typical drying time is 4-6 hours at 70°F and 50% relative humidity. Cooler temperatures or higher relative humidity can extend the drying time. Treated surfaces will be ready for pedestrian and vehicle traffic within 24 hours.
Clean equipment and tools with hot soapy water. Unused or old material may be disposed of in a waste disposal site in accordance with local, state and federal laws.
Avoid contact with skin, eyes and clothing, do not take internally. Use appropriate safety equipment during application and handling. Please refer to the safety data sheet (SDS) for additional precautionary instructions before use.
Sila-Tek™ 3500 is concentrated. 1 coat: Up to 1000 square feet. Variations in texture and porosity of substrate may affect the coverage and performance of the product.
What is the difference between the Lithi-Tek 4500 and Sila-Tek 3500? The Lithi-Tek 4500 is of a lithium silicate chemistry, whereas the Sila-Tek 3500 is of a sodium silicate chemistry.
What do you mix the concentrate with? The Sila-Tek 3500 concentrate is mixed with water. 1 gallon of Sila-Tek 3500 is mixed with 4 gallons of water.
Can I paint after sealing? Yes, you can paint after applying the Sila-Tek 3500.
Does the concrete need to be dry before sealing? Yes, the concrete needs to be as dry as possible before sealing. We recommend the moisture content of the concrete be less than 4%wt. It is recommended to wait at least 24-48 hours after rain and pressure washing before sealing.
My floor turned white after sealing, what happened? This is a common result of over application. Once the concrete reaches its point of absorption any material that was unable to penetrate reacts with the carbon dioxide in the air. This reaction leaves a white, powdery residue on the surface of the concrete. This can easily be removed by sweeping the concrete with a wire brush.
Why cant I use this product on brick or concrete blocks? This product is not recommended for use on brick because the Sila-Tek 3500 is a penetrating, reactive sealer. Bricks do not contain enough free lime and calcium for the sealer to react with and this causes the bricks to dry with a white, powdery residure. This product is not recommended on concrete blocks because concrete blocks are extremely porous. The best product to seal bricks and concrete blocks is the Siloxa-Tek 8500.
How many gallons do I need to treat 1000 square feet? You will need 1 gallons to treat 1000 square feet. Each concentrated gallon of Sila-Tek 3500 will cover up to 1000 square feet.
What can I use to apply this product? The Sila-Tek 3500 can be applied with a garden variety pump sprayer, 3/8" nap paint roller or a brush.
How do I mix the product with water? The Sila-Tek 3500 is a concentrated product that needs to be mixed with water prior to application. Pour the 1 gallon of Sila-Tek 3500 into a 5 gallon bucket. Next add 4 gallons of water into the 5 gallon bucket. Mix the water and 3500 mixture well. You can then pour the mixture into a sprayer to spray apply, or you can dip a nap paint roller into the bucket and roll apply.
How do I clean out the sprayer after sealing? Since the Sila-Tek 3500 is a water based product you can use regular soap and water to clean out the sprayer and other application tools.