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🔧 Seal smart, last longer — the pro’s choice for flawless joints!
SIKA Sikaflex 1a is a one-component, moisture-cured polyurethane sealant designed for durable, flexible sealing of concrete and masonry joints. It offers strong adhesion without primer, ±35% joint movement accommodation, and excellent weather resistance, making it ideal for vertical and horizontal applications like windows, doors, and roofing. Easy to apply with a standard sausage caulking gun, it cures fully in 24 hours to form a waterproof, non-sag elastomeric seal.










| ASIN | B00MH8ND16 |
| Best Sellers Rank | #42,549 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #23 in Polyurethane Adhesives #94 in Urethane Adhesives |
| Brand | SIKA |
| Brand Name | SIKA |
| Color | WHITE |
| Customer Reviews | 3.3 out of 5 stars 21 Reviews |
| Full Cure Time | 24 Hours |
| Initial Hardening Time | 6 Hours |
| Item Form | Liquid |
| Item Weight | 1.9 Pounds |
| Liquid Volume | 20 Fluid Ounces |
| Manufacturer | SIKA |
| Material Type | Polyurethane |
| Maximum Gap Fill | 0.5 Inches |
| Model | SIKA-91008 |
| Number of Items | 1 |
| Part Number | 91008 |
| Surface Recommendation | joints, fillets, windows, door frames, reglets, flashing |
| Temperature Range | 4E+1 Degrees Fahrenheit |
| UPC | 033886002981 |
| Unit Count | 20.0 Fluid Ounces |
| Water Resistance Level | Waterproof |
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