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🔧 Seal smart, stay secure — the pro’s choice for flawless finishes!
Sikaflex 521 is a premium white, low modulus polyurethane sealant designed for superior UV resistance and high electrical insulation. Ideal for sealing and bonding on diverse surfaces like metal, glass, wood, and plastic, it offers durable, water-resistant protection in a convenient 300ml cartridge. Trusted by professionals for outdoor and solar panel installations, it delivers strong adhesion and long-lasting performance.
| ASIN | B005FCIB04 |
| Brand | Sika |
| Colour | White |
| Compatible Material | Aluminium, Ceramic, Plastic, Wood |
| Customer Reviews | 3.6 out of 5 stars 18 Reviews |
| Global Trade Identification Number | 07612894448689 |
| Item Dimensions | 5.1 x 5.1 x 35.6 centimetres |
| Item Form | Liquid |
| Item Type Name | Great Product |
| Item Weight | 1 Pounds |
| Item dimensions L x W x H | 5.1 x 5.1 x 35.6 centimetres |
| Item weight | 1 Pounds |
| Manufacturer | Sika |
| Manufacturer Part Number | 106096 |
| Material | Polyurethane |
| Model Number | SIKA-106096 |
| Number of Items | 1 |
| Style | Compact |
| Style Name | Compact |
| Surface Recommendation | Glass, Metal, Plastic, Wood |
| Unit Count | 10.1 millilitre |
| Water Resistance Level | Water Resistant |
| Water resistance level | Water Resistant |
P**W
Works great
Used this in a recent solar panel install on a van and so far seems to work great. Been through one very significant rainfall about a week after install and everything seems to be sealed tight. Along with sealing our install, it also seems to have a very strong adhesion as even when things are unscrewed, still holding on strong. Made the mistake of forgetting a caulk gun...don't do that, not too easy to apply without it.
M**M
"STALE DATED SIKA 521UV" & GOT STUCK WITH A $22.00 RETURN SHIPPING FEE ????
Stale, old expired 521UV tube !!!! Sika you should be updated on what you sell. It was a pain returning it, along with me having to shell out $22.00 for return shipping on a stale dated item which was never mentioned in the returns ? I will be following up on this. Just out of curiosity, "SIKA" are your reading this, customer reviews do carry weight. Thx.
K**A
The best on the market
I use this product on the desk of my yacht with excellent performance. Also use it on the exterior of my older RV while the old sealant is dry, cracking and not holding the trim in place. The UV additive and consistency makes it the best buy. I have given up on 3M 5200/4200.
T**O
Ask about product date before purchase.
Purchase or be advised this product has the best before date. I was unaware of this when I purchased it and found out the best before date is only good for 7 months after I received it.
Trustpilot
4 days ago
2 months ago