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🔧 Seal smart, last longer — the pro’s choice for flawless finishes!
Sika Flex 521 UV is a premium 300 ml polyurethane hybrid sealant engineered for professional-grade waterproofing and adhesion. It delivers exceptional tensile strength (1500 PSI), superior weather and aging resistance, and bonds to a wide range of substrates including wood, metals, ceramics, and plastics. Free from solvents, silicone, and PVC, it offers a flexible, paintable, and sandable finish, making it ideal for durable, clean, and customizable sealing solutions.
| ASIN | B00A9UK1TQ |
| Best Sellers Rank | 48,622 in Automotive ( See Top 100 in Automotive ) 336 in Fillers, Adhesives & Sealants |
| Brand | Sika |
| Colour | Weiß |
| Country Of Origin | Germany |
| Customer Reviews | 4.6 out of 5 stars 6,679 Reviews |
| Full Cure Time | 3E+1 Minutes |
| Full cure time | 3E+1 Minutes |
| Global Trade Identification Number | 07611237142116 |
| Item Form | Paste |
| Item Type Name | Sika Flex-521UV Weatherproof Hybrid Sealant |
| Item Weight | 0.42 Kilograms |
| Item form | Paste |
| Item weight | 0.42 Kilograms |
| Liquid Volume | 300 Millilitres |
| Liquid volume | 300 Millilitres |
| Manufacturer | Sika |
| Material | Polyurethane Silicone silicone Polyvinyl chloride |
| Product Warranty | Product guarantees 0 months. |
| Surface Recommendation | Wall, ceiling, door, window |
| Tensile Strength | 1500 Pounds Per Square Inch |
| Unit Count | 300.0 millilitre(s) |
| Water Resistance Level | Water Resistant |
M**L
Needed it fast.
Needed this specific product for a client task. As always the main criteria was getting the item quick as this was a urgent task. Delivery was quick and well packaged. The product worked well but as this product was a requirement by the customer I don't think it's fair to compare it to other products. It has remained flexible and provided a weatherproof seal on the component.
K**N
Brilliant stuff very strong joint.
Easy to use, full size solar panel fitted to the caravan glued in 6 positions very strong joints fitted Saturday morning could not move it Sunday morning, no holes required in the caravan roof.
M**T
Solar panals glue
Great stuff used to glue solar panals on my van
L**N
Best sealant on the market
Use this before on our caravan would highly recommend
G**N
Sikaflex
Perfect for the job putting solar on campervan roof
S**E
Good sealant for motorhome, and general outdoor settings
Great sealant for motorhome
P**P
keep out the damp
Not tried this batch but last lot very good
A**R
Yes
Excellent
Trustpilot
1 day ago
2 months ago