---
product_id: 48284394
title: "Sika Flex 521 UV, White, Polyurethane Hybrid Multi-Purpose Sealant, Adhesive Sealant for Sealing and Elastic Joints, Weatherproof, 300 ml"
brand: "sika"
price: "AED 142"
currency: AED
in_stock: true
category: "Sika"
url: https://www.desertcart.ae/products/48284394-sika-flex-521-uv-white-polyurethane-hybrid-multi-purpose-sealant
store_origin: AE
region: United Arab Emirates
---

# High electrical resistance Paintable & sandable finish Weatherproof & aging resistant Sika Flex 521 UV, White, Polyurethane Hybrid Multi-Purpose Sealant, Adhesive Sealant for Sealing and Elastic Joints, Weatherproof, 300 ml

**Brand:** sika
**Price:** AED 142
**Availability:** ✅ In Stock

## Summary

> 🛠️ Seal smart, last longer — the pro’s choice for flawless finishes!

## Quick Answers

- **What is this?** Sika Flex 521 UV, White, Polyurethane Hybrid Multi-Purpose Sealant, Adhesive Sealant for Sealing and Elastic Joints, Weatherproof, 300 ml by sika
- **How much does it cost?** AED 142 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ae](https://www.desertcart.ae/products/48284394-sika-flex-521-uv-white-polyurethane-hybrid-multi-purpose-sealant)

## Best For

- sika enthusiasts

## Why This Product

- Trusted sika brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Custom Finish Ready:** Easily sanded and painted to blend perfectly with your project’s aesthetic.
- • **Flexible & Durable Seal:** Elastic formula maintains integrity under stress, ensuring long-lasting protection.
- • **Eco-Conscious & Safe Formula:** Solvent, silicone, and PVC-free for a cleaner, professional-grade application.
- • **Ultimate Weatherproof Shield:** Stay worry-free with superior resistance to aging and harsh weather conditions.
- • **Versatile Multi-Surface Adhesion:** Seamlessly bonds wood, metals, ceramics, plastics, and painted surfaces without special prep.

## Overview

Sika Flex 521 UV is a premium 300 ml polyurethane hybrid sealant designed for professional-grade sealing and bonding. It offers exceptional weather and aging resistance, adheres to a wide range of substrates including wood, metals, ceramics, and plastics, and features a flexible, paintable, and sandable finish. Free from solvents, silicone, and PVC, it ensures a durable, eco-conscious seal with high electrical resistance, making it ideal for demanding construction and repair projects.

## Description

Sika Flex 521 UV Hybrid Sealant is specially designed for waterproofing and simple adhesives that can be used on wood, metals, primers and paints, ceramics and plastics. This Sikaflex 521 UV hybrid sealant product has very good resistance to aging and weather conditions. Among its main advantages is its excellent resistance to aging and weather conditions good adhesion on many substrates without special treatment flexible surface can be sanded and painted under non-corrosive odor high electrical resistivity without solvents or isocyanates without silicone or PVC The characteristics of the Sikaflex 521 UV hybrid sealant: density: approx. 1.4 kg/l Colour: White Application temperature: from +5 °C to +40 °C Skin formation time: approx. 30 min. Packaging: 300 ml Reference: Packaging delivered in its original packaging Tips: Application cut the nozzle to the desired gasket size. For more satisfactory results, the sealant should be applied with a suitable manual or pneumatic pump gun or unit. Use SIKA products with caution.

## Features

- Contains Trimethoxyvinylsilane. May produce an allergic reaction.
- Warning! Hazardous respirable droplets may be formed when sprayed. Do not breathe spray or mist.
- Solvent-free, silicone-free and PVC-free sealant and adhesive
- SUSTAINABILITY: Weather and aging resistant
- SUPPORTS: Adheres to a variety of substrates such as wood, metals, primed and painted metals (bicomponent systems), ceramic materials and plastics
- Can be painted and can be sanded
- Elastic and high electrical resistance; It is used by experienced professionals

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00A9UK1TQ |
| Best Sellers Rank | 13,438 in Automotive ( See Top 100 in Automotive ) 150 in Fillers, Adhesives & Sealants |
| Brand | Sika |
| Colour | Weiß |
| Country Of Origin | Germany |
| Customer Reviews | 4.6 4.6 out of 5 stars (7,274) |
| 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 |
| Liquid Volume | 300 Millilitres |
| Manufacturer | Sika |
| Manufacturer Part Number | 54864 |
| Material | Polyurethane Silicone silicone Polyvinyl chloride |
| Model Number | 54864 |
| Number of Items | 1 |
| Product Warranty | Product guarantees 0 months. |
| Surface Recommendation | Wall, ceiling, door, window |
| Tensile Strength | 1500 Pounds Per Square Inch |
| Unit Count | 300.0 millilitre |
| Water Resistance Level | Water Resistant |

## Product Details

- **Brand:** Sika
- **Colour:** Weiß
- **Full cure time:** 3E+1 Minutes
- **Item weight:** 0.42 Kilograms
- **Liquid volume:** 300 Millilitres

## Images

![Sika Flex 521 UV, White, Polyurethane Hybrid Multi-Purpose Sealant, Adhesive Sealant for Sealing and Elastic Joints, Weatherproof, 300 ml - Image 1](https://m.media-amazon.com/images/I/61FfAoQnHzL.jpg)

## Questions & Answers

**Q: Can this be over sprayed with a clear lacquer to protect from discolouration or would the lacquer just peel off in time?**
A: My answer to your question is no. Because of the way sikaflex works is that it doesn't dry totally so it remains flexible to take up movement. This leaves the seal intact and waterproof. Paint or lacquer will crack a fall off in my experience

**Q: can it be smoothed with soap water?**
A: I've just used it to seal my lockers on our caravan. Used a mastic gun. I would not personally use soap to smooth it over. Once on its better than no more nails. But like I say I used it for our caravan.. Excellent stuff

## Frequently Bought Together

- Sika Flex 521 UV, White, Polyurethane Hybrid Multi-Purpose Sealant, Adhesive Sealant for Sealing and Elastic Joints, Weatherproof, 300 ml
- Sika Sikaflex-522 Caravan And Motorhome Adhesive Sealant – Weather And Mould Resistant – White – 300ml

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.ae/products/48284394-sika-flex-521-uv-white-polyurethane-hybrid-multi-purpose-sealant](https://www.desertcart.ae/products/48284394-sika-flex-521-uv-white-polyurethane-hybrid-multi-purpose-sealant)

---

*Product available on Desertcart United Arab Emirates*
*Store origin: AE*
*Last updated: 2026-10-30*