Packaging Size: 300 ml cartridge
Packaging Type: Tube
Colours Available: Black, White, Grey, Clear
Brand: Dowsil
Cure Type: Neutral Cure
Compatible Materials: Glass, Aluminium, Coated Metals, Ceramic Tiles
Country of Origin: Made in India
Availability: In Stock
When it comes to protecting a building’s exterior from the relentless forces of nature, engineers and architects worldwide turn to one name: Dowsil (formerly Dow Corning). DOWSIL 789 Weatherproof Silicone Sealant 600ml is a premium, high-performance, neutral-curing silicone specifically designed to seal the building envelope against air and water infiltration.
In a city like Delhi, where buildings face extreme heat in summer and heavy rain during monsoons, a standard sealant simply won’t last. DOWSIL 789 Silicone Sealant is engineered to withstand these specific challenges. At Poly Prime Industry, we are committed to supplying genuine DOWSIL 789 Weatherproof Silicone Sealant 600ml to contractors and fabricators across the NCR, ensuring that every joint we seal contributes to the longevity and safety of the structure.
Unlike acetic sealants that release acidic vapors, DOWSIL 789 Weatherproof Silicone Sealant 600ml is non-corrosive. It is 100% safe for use on sensitive architectural materials such as:
Coated Glass: It won’t damage the reflective or low-E coatings.
Metals: Safe for anodized aluminum, galvanized steel, and copper.
Stone & Masonry: It provides excellent adhesion to concrete and brick without the risk of chemical staining.
Time is a critical factor on construction sites. DOWSIL 789 Weatherproof Silicone Sealant 600ml reacts quickly with atmospheric moisture to form a tack-free surface, allowing projects to move forward without long wait times. Its smooth, buttery consistency ensures that applicators can tool the joints easily for a professional finish.
DOWSIL 789 Silicone Sealant is formulated with a high-purity silicone polymer that is virtually unaffected by sunlight (UV radiation), ozone, or extreme temperature variations. It does not become brittle in the winter or soft and sticky in the summer, maintaining a perfect seal from -50°C to +150°C.
Modern buildings are designed to move. Thermal expansion and wind loads cause joints to widen and narrow. Dowsil 789 is a medium-modulus sealant with exceptional elasticity. It can stretch and compress repeatedly without losing its bond or tearing, making it ideal for high-rise facades.
Architecture is about more than just strength—it’s about beauty. To match the diverse color palettes of modern building materials, Dowsil 789 is available in:
Black: For dark-framed curtain walls and ACP.
White: For clean UPVC window perimeters and sanitary finishes.
Grey: To blend seamlessly with concrete and stone cladding.
Clear: For transparent glass-to-glass joints where a hidden seal is required.
In most cases, DOWSIL 789 Silicone Sealant forms a strong, durable bond with glass and aluminum without the need for a primer, saving both labor costs and material expenses on-site.
The versatility of DOWSIL 789 Silicone Sealant makes it indispensable for:
Façade Glazing: Used as a secondary seal in curtain walls to ensure the system is completely watertight.
Window & Door Perimeters: Providing the final weather-seal between the outer frame (Aluminum/UPVC) and the building’s masonry or concrete.
Expansion Joints: Sealing joints in exterior elevations that are subject to high movement and environmental stress.
ACP Cladding: The preferred choice for sealing gaps between Aluminum Composite Panels (ACP) due to its UV stability and flexibility.
Roofing & Skylights: Sealing skylights and metal roofing components where water-tightness is non-negotiable.
| Feature | Technical Detail |
| Brand | Dowsil (Formerly Dow Corning) |
| Model | 789 Weatherproof Silicone |
| Packaging | 500 ml Cartridge |
| Cure Type | Neutral Alkoxy |
| Application Temp | +5°C to +40°C |
| Service Temp | -50°C to +150°C |
| Movement Capability | ± 25% / 50% |
| Shelf Life | 12 Months from Date of Manufacture |
For a warrantable, long-lasting seal with DOWSIL 789 Weatherproof Silicone Sealant 600ml, follow these expert steps:
Clean: Ensure surfaces are clean, dry, and frost-free. Use a “Two-Wipe” cleaning method with a lint-free cloth and a solvent (like IPA) for non-porous surfaces.
Backing: Use a closed-cell PE Backing Rod to control the sealant depth. This ensures the sealant only bonds to the side walls, allowing for maximum flexibility.
Apply: Use a professional caulking gun to apply a continuous bead of Dowsil 789. Ensure the sealant fills the joint completely to avoid air pockets.
Tool: Tool the sealant within 10-15 minutes using a spatula. This presses the sealant against the joint surfaces for optimal adhesion and creates a smooth, professional aesthetic.
As a premium wholesale distributor in Delhi (Krishna Nagar), Poly Prime Industry provides the reliability that project managers and contractors need.
100% Genuine Dowsil Stock: The market is full of expired or counterfeit products. We guarantee that every cartridge of Dowsil 789 we sell is 100% original and direct from authorized channels.
Fresh Inventory: We monitor batch dates strictly. Our DOWSIL 789 Weatherproof Silicone Sealant 600ml stock is always fresh, ensuring you get the maximum shelf life and peak performance on-site.
Ready Bulk Stock in Delhi: Whether you need 10 boxes or 100, we maintain a ready inventory of Black, White, Grey, and Clear colors for immediate pickup or delivery.
Competitive Wholesale Rates: We offer the best bulk pricing in the Delhi NCR region, helping you keep your project costs low without sacrificing quality.
Q1. Can DOWSIL 789 Silicone Sealant be used for structural glazing?
Dowsil 789 is a Weatherproofing sealant. While it has great strength, it is designed for sealing gaps against weather. For Structural bonding (where the silicone holds the glass panel in place), we recommend DOWSIL 789 Silicone Sealant or Wacker SG79.
Q2. Is DOWSIL 789 Silicone Sealant safe for natural stone?
DOWSIL 789 Silicone Sealant is a neutral-cure silicone and is generally safe. However, for highly porous stones like white marble, we always recommend a small patch test to ensure there is no “fluid migration” or staining.
Q3. How long does Dowsil 789 take to fully cure?
It skins over in about 15-20 minutes. A full deep-cure (through the entire bead) usually takes 7 to 14 days, depending on the humidity and joint thickness.
Q4. Where can I buy DOWSIL 789 Silicone Sealant wholesale in Delhi?
Poly Prime Industry is your authorized wholesale source in Delhi. We offer competitive rates and fast dispatch across Delhi, Noida, and Gurgaon.
Don’t let your building’s exterior be compromised by low-quality sealants. Choose the global trust of DOWSIL 789 Weatherproof Silicone Sealant 600ml. When you partner with Poly Prime Industry, you get the best products and the best service in the industry.
