---
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: "€ 57.05"
currency: EUR
in_stock: true
url: https://www.desertcart.nl/products/48284394-sika-flex-521-uv-white-polyurethane-hybrid-multi-purpose-sealant
store_origin: NL
region: Netherlands
---

# High electrical resistance Multi-surface adhesion Weather & 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:** € 57.05
**Availability:** ✅ In Stock

## Summary

> 🛠️ Seal the deal with Flex 521 UV — where durability meets design finesse!

## 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?** € 57.05 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nl](https://www.desertcart.nl/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

- • **Customizable Finish:** Paintable and sandable to match your design vision perfectly.
- • **Pro-Grade Elasticity:** Flexible yet durable—trusted by experts for resilient, long-lasting joints.
- • **Eco-Smart & Safe Formula:** Solvent, silicone, and PVC-free for a cleaner, greener workspace.
- • **Versatile Surface Master:** Seamlessly bonds wood, metals, ceramics, and plastics for flawless finishes.
- • **Ultimate Weatherproof Shield:** Stay worry-free with a sealant that defies time and elements.

## Overview

Flex 521 UV is a 300 ml white polyurethane hybrid sealant by Sika, engineered for multi-purpose sealing and elastic joints. It offers superior weather and aging resistance, adheres to diverse substrates including wood, metals, ceramics, and plastics, and is solvent-, silicone-, and PVC-free. Paintable and sandable, it combines professional-grade elasticity with high electrical resistance, making it the go-to choice for durable, clean, and versatile sealing solutions.

## Description

Sika Flex 521 UV, White, Polyurethane Hybrid Multi-Purpose Sealant, Adhesive Sealant for Sealing and Elastic Joints, Weatherproof, 300 ml

## Features

- 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 |
|---------------|-------|
| Manufacturer | Sika |
| Brand | Sika |
| Model | Sikaflex-521 UV (Alt) |
| Product Dimensions | 4.9 x 4.9 x 22.5 cm; 420 g |
| Item model number | 54864 |
| Manufacturer part number | 54864 |
| Special Features | BIANCO |
| Item Weight | 420 g |

## Product Details

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

## 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/416nKxl0wkL.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

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

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*Product available on Desertcart Netherlands*
*Store origin: NL*
*Last updated: 2026-01-26*