---
product_id: 329500862
title: "Sikaflex 521 UV – Weathering Resistant Silane Terminated Polymer Adhesive Sealant – Age Resistant – Low Odour – Overpaintable – Black – 300ml"
brand: "sika"
price: "€ 83.88"
currency: EUR
in_stock: true
category: "Sika"
url: https://www.desertcart.hr/products/329500862-sikaflex-521-uv-weathering-resistant-silane-terminated-polymer-adhesive-sealant
store_origin: HR
region: Croatia
---

# overpaintable & sandable finish weather & age resistant formula 300ml professional-grade cartridge Sikaflex 521 UV – Weathering Resistant Silane Terminated Polymer Adhesive Sealant – Age Resistant – Low Odour – Overpaintable – Black – 300ml

**Brand:** sika
**Price:** € 83.88
**Availability:** ✅ In Stock

## Summary

> 🔧 Seal it like a pro, last like a legend!

## Quick Answers

- **What is this?** Sikaflex 521 UV – Weathering Resistant Silane Terminated Polymer Adhesive Sealant – Age Resistant – Low Odour – Overpaintable – Black – 300ml by sika
- **How much does it cost?** € 83.88 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/329500862-sikaflex-521-uv-weathering-resistant-silane-terminated-polymer-adhesive-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:** Sandable and overpaintable for a flawless, professional look every time
- • **Durability That Lasts:** Age and weather-resistant formula ensures long-term performance indoors & out
- • **Pro-Level Application:** Compatible with hand, pneumatic & electric piston guns for precision control
- • **Low Odour, High Comfort:** Isocyanate and solvent-free for safer, more pleasant use on any job site
- • **Universal Bonding Power:** Seamlessly bonds timber, metals, ceramics & plastics without special prep

## Overview

Sika Sikaflex 521 UV is a 300ml silane-terminated polymer adhesive sealant designed for professional use. It bonds and seals multiple substrates including timber, metals, ceramics, and plastics without special pre-treatment. Its weather and age-resistant formula cures in 24 hours, is low odour, and allows sanding and overpainting for a high-quality finish, making it ideal for both internal and external applications.

## Description

Need a long-lasting adhesive and sealant you can use on a wide variety of surfaces? SikaFlex 521 is an STP adhesive and sealant designed to be long-lasting and customisable. It's suitable for internal and external use on materials such as timber, metals, metal primers and paint coatings (2-component systems), ceramic materials and plastics. Apply using a hand, pneumatic or electric-driven piston gun and tool within the 30-minute skin time. It will fully cure using atmospheric moisture in around 24 hours to an age and weathering-resistant finish. Choose from white, black and grey shades. You can also sand and overpaint the final product.

## Features

- PROFESSIONAL PRODUCT – Designed for use by professional applicators.
- SUITABLE FOR USE ON MULTIPLE SUBSTRATES – Use it to bond or seal various materials, including timber, metals, metal primers and paint coatings (2-component systems), ceramic materials and plastics.
- IDEAL FOR INTERNAL AND EXTERNAL USE – Isocyanate and solvent-free black adhesive and sealant ideal for multiple applications.
- NO SPECIAL PRE-TREATMENTS REQUIRED – Bonds and seals a wide variety of materials with no need for special pre-treatments.
- LONG LASTING – Sikaflex 521 UV black is age and weathering-resistant, delivering a bond that lasts.
- HIGH QUALITY FINISH – Both sandable and overpaintable to enable you to create a seamless look whatever the job.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00BEFI8EA |
| Best Sellers Rank | #72,321 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #412 in Hardware Sealers |
| Item model number | 60179 |
| Manufacturer | Sika |
| Product Dimensions | 5 x 5 x 21 cm; 417 g |

## Product Details

- **Brand:** SIKA
- **Colour:** Schwarz
- **Full cure time:** 24 Hours
- **Item weight:** 0.42 Kilograms
- **Liquid volume:** 300 Milliliters

## Images

![Sikaflex 521 UV – Weathering Resistant Silane Terminated Polymer Adhesive Sealant – Age Resistant – Low Odour – Overpaintable – Black – 300ml - Image 1](https://m.media-amazon.com/images/I/416SozZ7vKL.jpg)

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**Shop now:** [https://www.desertcart.hr/products/329500862-sikaflex-521-uv-weathering-resistant-silane-terminated-polymer-adhesive-sealant](https://www.desertcart.hr/products/329500862-sikaflex-521-uv-weathering-resistant-silane-terminated-polymer-adhesive-sealant)

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-03-02*