BOSLAI JS Cementitious Waterproof Coating (JS Waterproof Coating) is a two-component polymer waterproof coating. The liquid component consists of polyacrylate emulsion and other copolymer emulsions, while the powder component is composed of cement powder, quartz sand, and other inorganic powders. This coating has high waterproofing, durability, and impermeability. It adheres strongly to cement.
The ratio of liquid to powder is 1:2. The color can be customized. This product can be applied by brush or spray.This product cannot be exposed and requires a layer of concrete top to be applied over it.
Double-component / Eco friendly / OEM Accepted / Can be brushed and sprayed / Cost Effective
APPLICATION RANGE – JS Cementitious Waterproof Coating
1.Building Surfaces: Roofs, walls.
2.Indoor Spaces: Bathrooms, Warehouses, Kitchens.
3.Special Structures: Basements, Pools.
4.Infrastructure: Tunnels, Bridges, Reservoirs.
PACKAGING & COVERAGE – JS Cementitious Waterproof Coating
| Specification: | 18kg/pail or 50kg/pail |
| Appearance: | Two components, white liquid and gray powder, color can be customized. |
| Coverage: | It is recommended to apply two coats, with each pail covering 13~15m2. |
| Warranty period: | Normal Quality: 6~8 years. Excellent Quality: more than 10 years. |
| Shelf Life: | 1 Year |
TECHNICAL DATA – JS Cementitious Waterproof Coating
| Item | Data |
| Setting Time (Initial Setting) | 9.5h |
| Setting Time (Final Setting) | 11h 45min |
| Permeability Pressure, 7d | 1.0 MPa |
| Permeability Pressure, 28 d | 1.5 MPa |
| Permeability Strength 28 d | 29.3 MPa |
| Flexural Strength 28 d | 9.4 MPa |
| Compressive Flexural Ratio | 2.2 |
| Adhesion Strength, 7 d | 1.2 MPa |
| Adhesion Strength, 28 d | 1.5 MPa |
| Alkali ResistanceSaturated Ca(OH)2 solution, 168h | No cracking or peeling |
| Heat Resistance(100°C water, 5h) | No cracking or peeling |
| Freeze Resistance – Freeze-thaw Cycle(-15°C ~ +20°C), 25 cycles | No cracking or peeling |
| Shrinkage Rate，28d | 0.09% |
Download JS Waterproof Coating TDS (PDF)
TDS_JS Polymer Cementitious Waterproof Coating
Key Advantages of BOSLAI JS Waterproof Coating
BOSLAI JS Cement based Waterproof Coating offers 5 core advantages:
- Strong Adhesion: The bonding strength with cement-based surfaces can reach over 1.5 MPa, ensuring the stability and reliability of the waterproof layer.
- Eco-friendly and Safe: Recognized as a green and environmentally friendly material, with stable performance, aging resistance, and non-toxic, harmless properties.
- Efficient Film Formation: Excellent film-forming effect with fast curing speed, quickly forming a superior waterproof layer.
- Convenient Construction: Easy to apply, can be directly applied on damp surfaces, and is not prone to bubble formation.
- Cost-Effective: Simple construction process with low costs, and treated surfaces can accommodate additional coatings.
Packaging, MOQ, and Export Shipping
Standard packaging is 18kg, 20kg or 50kg pails. MOQ is 200 kg if you have a freight forwarder in China; otherwise the minimum shipment follows your shipping line’s requirement (around 2 to 3 CBM). Free samples are available so you can verify adhesion and film quality on your actual substrate before ordering.
Lead time is 4 days for standard stock; OEM orders take 7 days depending on packaging design. We ship with CIF, FOB, EXW with complete export documentation — TDS, MSDS, and Non-dangerous goods classification for smooth customs clearance.
OEM & Customization Service
Customization is available for product color, packaging design, and package sizes.
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FAQ
Q: What is JS cementitious waterproof coating?
JS polymer cementitious waterproof coating is a two-component waterproof material — liquid polyacrylate emulsion mixed with powder cement, quartz sand, and inorganic fillers at a 1:2 ratio. Once cured, it forms a highly adhesive, impermeable waterproof membrane that bonds strongly to concrete. It cannot be left exposed and requires a cement topping or tile layer over it.
Q: Can JS cementitious waterproof coating be applied on damp surfaces?
Yes. This is a water-based product that can be applied on slightly damp cement substrates — just moisten the surface beforehand. No standing water should be present. This makes it practical for basements, bathrooms, and below-grade applications where achieving a fully dry surface is difficult.
Q: Can JS waterproof coating be used for outdoor applications?
JS waterproof coating is designed for covered applications only. It cannot be exposed to direct sunlight and must be covered with a cement topping (1.5–2.0 cm) or tiled over. For outdoor exposed waterproofing, consider BOSLAI metal roof waterproof coating or polymer modified bitumen waterproof coating instead.
Q: Can tiles be applied directly over JS waterproof coating?
Yes. JS cementitious waterproof coating is designed to be covered. After the coating has fully cured — normally 48 to 72 hours at 20°C — apply a 1.5–2.0 cm cement mortar layer or tile adhesive directly onto the surface, then install the tiles. No primer is required, because the cement-based coating surface bonds well with cement mortar and tile adhesive.
Q: How many coats are required and what is the coverage per pail?
At least two coats are recommended. Each 18kg pail covers approximately 13–15 m² per coat on standard cement surfaces. For high-stress areas like basements, tunnels, or water tanks, three coats are recommended with fiber mesh reinforcement at corners, joints, and pipe penetrations.
Q: How to find a reliable JS cementitious waterproof coating supplier?
Evaluate suppliers on 5 criteria: (1) TDS and specifications available before ordering. (2) Specialized waterproofing manufacturer with in-house formulation — not a general chemical trader. (3) Free sample support to test on your actual substrate. (4) OEM capability for custom packaging, color, and labeling. (5) Export experience with MSDS, dangerous goods classification, and customs documentation. At BOSLAI, we provide downloadable TDS, sample support, OEM customization, and export experience across Southeast Asia, the Middle East, Africa, and Europe.
Q: How long does JS waterproof coating last?
Service life depends on the grade specified. BOSLAI JS cementitious waterproof coating is warranted for 6 to 8 years in normal quality and more than 10 years in excellent quality, when applied at the recommended 1.5–2.0 mm dry film thickness and protected by a cement topping or tile layer. Proper surface preparation and two-coat application are the main factors determining actual lifespan.
Q: How much does JS cementitious waterproof coating cost?
JS cementitious waterproof coating is quoted per kilogram or per pail, FOB China. Pricing depends on order volume, packaging size (18 kg / 50 kg pail), color customization, and OEM requirements. Standard MOQ is 200 kg if you have a freight forwarder in China. Send us your target quantity and destination port and we will reply with a full price sheet.
A Reliable JS Waterproof Coating Factory with In-House Production
As a specialized JS waterproof coating factory, BOSLAI manufactures JS cementitious waterproof coating in-house — from raw material to finished pail. Unlike general traders, we control every batch: adhesion strength (1.5 MPa at 28 days), permeability resistance (1.5 MPa), and freeze-thaw durability. As a dedicated cementitious waterproofing supplier, we offer downloadable TDS, free samples for testing, and full OEM customization including private-label packaging, custom colors, and tailored formulations.
Trusted JS Waterproof Coating for Vietnam and Global Markets
BOSLAI JS waterproof coating is widely specified across Vietnam, where high humidity and monsoon rainfall demand reliable cement based waterproof coating for basements, bathrooms, and tiled roofs. We export to distributors and importers across Southeast Asia, the Middle East, Africa, and Europe — with MSDS documentation, dangerous goods classification, and freight forwarder coordination. Competitive factory pricing and flexible minimum order quantities help our partners grow their market share. Whether you supply construction material dealers or manage large-scale infrastructure projects, contact us for a sample and quotation.
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