---
product_id: 57255900
title: "Sika Sikaflex 521 UV – Weathering Resistant STP Adhesive Sealant – Multipurpose – Low Odour – Age And Weather Resistant – Light Grey – 300ml"
brand: "sika"
price: "23808 Ft"
currency: HUF
in_stock: true
reviews_count: 13
category: "Sika"
url: https://www.desertcart.hu/products/57255900-sika-sikaflex-521-uv-weathering-resistant-stp-adhesive-sealant-multipurpose
store_origin: HU
region: Hungary
---

# Paintable & sandable after curing Superior weather & age resistance 300ml professional-grade cartridge Sika Sikaflex 521 UV – Weathering Resistant STP Adhesive Sealant – Multipurpose – Low Odour – Age And Weather Resistant – Light Grey – 300ml

**Brand:** sika
**Price:** 23808 Ft
**Availability:** ✅ In Stock

## Summary

> 🔧 Seal the deal with pro-grade strength and style!

## Quick Answers

- **What is this?** Sika Sikaflex 521 UV – Weathering Resistant STP Adhesive Sealant – Multipurpose – Low Odour – Age And Weather Resistant – Light Grey – 300ml by sika
- **How much does it cost?** 23808 Ft with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hu](https://www.desertcart.hu/products/57255900-sika-sikaflex-521-uv-weathering-resistant-stp-adhesive-sealant-multipurpose)

## 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

- • **Low Odour & Safe:** Solvent-free and low odour, ensuring a comfortable, safe workspace.
- • **Effortless Finish:** Paintable and sandable once cured, blending seamlessly into any design.
- • **Unmatched Durability:** Flexible polymer formula resists aging and harsh weather for long-lasting bonds.
- • **Versatile Application:** Bonds timber, metals, ceramics, plastics—no priming needed for professional results.
- • **Interior & Exterior Ready:** Perfect for both indoor and outdoor projects with consistent performance.

## Overview

Sika Sikaflex 521 UV is a 300ml professional-grade STP adhesive sealant designed for multipurpose use. Its flexible polyurethane formula offers exceptional resistance to aging and weathering, making it ideal for both interior and exterior applications. Low odour and solvent-free, it bonds a wide range of materials without priming and can be sanded and painted after curing for a flawless finish.

## Description

Shop Sika Sikaflex 521 UV – Weathering Resistant STP Adhesive Sealant – Multipurpose – Low Odour – Age And Weather Resistant – Light Grey – 300ml. Free delivery on eligible orders of £20 or more.

Review: Sika really works - Great product because is really works.
Review: Brilliant product - Wouldn’t use anything else this is a great project

## Features

- Contains Trimethoxyvinylsilane. May produce an allergic reaction.
- Safety data sheet available on request.
- PROFESSIONAL PRODUCT – Designed for use by professional applicators.
- DURABLE FORMULA – Once cured, this flexible polymer adhesive is resistant to ageing and weathering, ensuring long-lasting bonds.
- WIDE RANGE OF APPLICATIONS – Ideal for bonding a wide range of substrates without the need for priming, including timber, metals, metal primers and paint coatings, ceramic materials and plastics.
- ADAPTABLE AND SAFE – This Sikaflex sealant is crafted from isocyanate and is solvent-free, meaning it's flexible and can be safely sanded and painted once cured.
- SUITABLE FOR INTERIOR AND EXTERIOR USE – Use this hardwearing, long-lasting and protected grey sealant anywhere regular or flexible finishes are required.
- THREE COLOURS AVAILABLE – Apply this light grey sealant using a hand, pneumatic or electric-driven piston gun. Also available in white and black.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00BEFGCE8 |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 12,691 in DIY & Tools ( See Top 100 in DIY & Tools ) 2 in Adhesive Caulk |
| Colour | Light Grey |
| Customer Reviews | 4.6 4.6 out of 5 stars (1,693) |
| Date First Available | 10 Nov. 2013 |
| Included components | 1 cartridge |
| Item Package Quantity | 1 |
| Item Weight | 420 g |
| Item model number | 512UV |
| Manufacturer | Sika |
| Material | Polyurethane Silicone silicone Polyvinyl chloride |
| Measurement System | Metric |
| Number of Pieces | 1 |
| Part number | 62139 |
| Product Dimensions | 5 x 5 x 21 cm; 420 g |
| Size | 300ml |
| Specific uses | Professional |
| Style | single |
| Volume | 300 Millilitres |

## Product Details

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

## Images

![Sika Sikaflex 521 UV – Weathering Resistant STP Adhesive Sealant – Multipurpose – Low Odour – Age And Weather Resistant – Light Grey – 300ml - Image 1](https://m.media-amazon.com/images/I/51JsoqssyBL.jpg)

## Questions & Answers

**Q: is there supposed to be a Caulk Nozzles with this item.**
A: Mine didn't have any, can buy packs of five nozzles from wickes or similar shops...

**Q: Whats the expiry date of this product**
A: This is dependant on the batch purchased, details will be present on the tube

**Q: Which product is best for bonding in windows on steel narrow boat?**
A: I send the black version for resealing fibreglass roof to windscreen area on motor home 9 months ago. Still holding well.
I used the white version for sealing in a new skylight on motorhome. Once again, no issues so far. That was about a year ago.

**Q: Is this suitable to glue a solar panel to camper van roof**
A: Unfortunately the Sikaflex 521UV would not be suitable

## Customer Reviews

### ⭐⭐⭐⭐⭐ Sika really works
*by J***E on 7 September 2025*

Great product because is really works.

### ⭐⭐⭐⭐⭐ Brilliant product
*by A***K on 7 September 2025*

Wouldn’t use anything else this is a great project

### ⭐⭐⭐⭐⭐ Weather proof joints in car prodject
*by M***F on 14 November 2025*

Used on defender roof gutter rail prior to painting great product

## 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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**Shop now:** [https://www.desertcart.hu/products/57255900-sika-sikaflex-521-uv-weathering-resistant-stp-adhesive-sealant-multipurpose](https://www.desertcart.hu/products/57255900-sika-sikaflex-521-uv-weathering-resistant-stp-adhesive-sealant-multipurpose)

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*Product available on Desertcart Hungary*
*Store origin: HU*
*Last updated: 2026-03-10*