---
product_id: 395275219
title: "Sika Sikaflex 521UV Weathering Resistant Silane Terminated Polymer (STP) Adhesive Sealant, Light Grey, 300 ml"
brand: "sika"
price: "€ 60.73"
currency: EUR
in_stock: true
url: https://www.desertcart.ie/products/395275219-sika-sikaflex-521uv-weathering-resistant-silane-terminated-polymer-stp-adhesive
store_origin: IE
region: Ireland
---

# bonds diverse substrates UV & weather resistant 1-component STP tech Sika Sikaflex 521UV Weathering Resistant Silane Terminated Polymer (STP) Adhesive Sealant, Light Grey, 300 ml

**Brand:** sika
**Price:** € 60.73
**Availability:** ✅ In Stock

## Summary

> 🔗 Seal your projects with confidence—where durability meets versatility!

## Quick Answers

- **What is this?** Sika Sikaflex 521UV Weathering Resistant Silane Terminated Polymer (STP) Adhesive Sealant, Light Grey, 300 ml by sika
- **How much does it cost?** € 60.73 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/395275219-sika-sikaflex-521uv-weathering-resistant-silane-terminated-polymer-stp-adhesive)

## 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

- • **Universal Bonding:** Seamlessly adheres to timber, metals, ceramics, plastics, and more—no special pre-treatment needed.
- • **One-Component Power:** Simplify your workflow with a single-component STP adhesive that cures reliably without mixing.
- • **Weatherproof Wonder:** Engineered to resist UV rays and harsh weather, ensuring long-lasting external and internal seals.
- • **Effortless Precision:** Compatible with standard caulk guns for smooth, professional-grade application every time.
- • **Safe & Clean Application:** Isocyanate- and solvent-free formula means safer handling and eco-conscious use.

## Overview

Sika Sikaflex 521UV is a professional-grade, weathering-resistant silane terminated polymer adhesive sealant in light grey, designed for both internal and external use. It bonds strongly to a wide range of substrates including metals, timber, ceramics, and plastics without special pre-treatment. This 300 ml, isocyanate- and solvent-free sealant offers easy application via caulk gun, making it the go-to solution for durable, multipurpose sealing and bonding.

## Description

Sika Sikaflex 521UV Weathering Resistant Silane Terminated Polymer (STP) Adhesive Sealant, Light Grey, 300 ml

## Features

- Designed for professional use
- Suitable substrate materials include timber, metals, metal primers and paint coatings (2-component systems), ceramic materials and plastics.
- This multipurpose product is suitable for internal and external sealing applications, suitable for internal and external sealing applications
- Bonds well to a wide variety of substrates
- Isocyanate- and solvent-free.Easy to apply with a caulk sealant cartridge applicator gun

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Sika |
| Brand | SIKA |
| Model | Sikaflex-521 UV (Alt) |
| Product Dimensions | 5 x 5 x 21 cm; 420 g |
| Item model number | 512UV |
| Manufacturer Part Number | 62139 |
| Item Weight | 420 g |

## Product Details

- **Colour:** Grau
- **Brand:** SIKA
- **Item weight:** 0.42 Kilograms
- **Liquid volume:** 300 Milliliters
- **Full cure time:** 30 Minutes

## Images

![Sika Sikaflex 521UV Weathering Resistant Silane Terminated Polymer (STP) Adhesive Sealant, Light Grey, 300 ml - Image 1](https://m.media-amazon.com/images/I/6173Cv7FCvL.jpg)

## Available Options

This product comes in different **Color** options.

## Frequently Bought Together

- Sika Sikaflex 521 UV – Weathering Resistant STP Adhesive Sealant – Multipurpose – Low Odour – Age And Weather Resistant – Light Grey – 300ml
- Sika Mounting Adhesive - Sikaflex-554 Black - Ideal for Large Components and High Dynamic Load - Ageing and Weather Resistant - 300 ml
- Sika Sikaflex-522 Caravan And Motorhome Adhesive Sealant – Weather And Mould Resistant – White – 300ml

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*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-02-12*