---
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: "€ 61.75"
currency: EUR
in_stock: true
reviews_count: 13
category: "Sika"
url: https://www.desertcart.sk/products/57255900-sika-sikaflex-521-uv-weathering-resistant-stp-adhesive-sealant-multipurpose
store_origin: SK
region: Slovakia
---

# paintable & sandable after curing UV & weather resistant formula 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:** € 61.75
**Availability:** ✅ In Stock

## Summary

> 🌟 Seal the deal with pro-grade strength and weatherproof confidence!

## 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?** € 61.75 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/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

- • **Effortless Use:** Compatible with hand, pneumatic & electric piston guns for precision and speed
- • **Seamless Finish:** Cures to a paintable, sandable surface—perfect for flawless, customized results
- • **Unmatched Durability:** Flexible polymer resists aging & harsh weather for long-lasting bonds
- • **Pro-Grade & Low Odour:** Designed for professionals with a low-odour, solvent-free formula for safer indoor/outdoor use
- • **Versatile Application:** Bonds timber, metals, ceramics & plastics without priming—one sealant, endless projects

## Overview

Sika Sikaflex 521 UV is a 300ml professional-grade, multipurpose STP adhesive sealant engineered for superior weather and UV resistance. Its flexible, solvent-free formula bonds a wide range of materials without priming and cures to a paintable, sandable finish, making it ideal for both interior and exterior applications. Trusted by professionals for durable, low-odour performance in demanding environments.

## 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: Replacing Headlamp Lenses - BMW - Good product! Used this when replacing the headlamp lenses on my BMW F10 (due to condensation). Would use again
Review: Weather proof joints in car prodject - Used on defender roof gutter rail prior to painting great product

## 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 | 3,968 in DIY & Tools ( See Top 100 in DIY & Tools ) 1 in Adhesive Caulk |
| Colour | Light Grey |
| Customer Reviews | 4.6 4.6 out of 5 stars (1,704) |
| 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)
![Sika Sikaflex 521 UV – Weathering Resistant STP Adhesive Sealant – Multipurpose – Low Odour – Age And Weather Resistant – Light Grey – 300ml - Image 2](https://m.media-amazon.com/images/I/71Pqk3PSXKL.jpg)
![Sika Sikaflex 521 UV – Weathering Resistant STP Adhesive Sealant – Multipurpose – Low Odour – Age And Weather Resistant – Light Grey – 300ml - Image 3](https://m.media-amazon.com/images/I/81PbJ60Z2zL.jpg)
![Sika Sikaflex 521 UV – Weathering Resistant STP Adhesive Sealant – Multipurpose – Low Odour – Age And Weather Resistant – Light Grey – 300ml - Image 4](https://m.media-amazon.com/images/I/71BG2rY1l5L.jpg)
![Sika Sikaflex 521 UV – Weathering Resistant STP Adhesive Sealant – Multipurpose – Low Odour – Age And Weather Resistant – Light Grey – 300ml - Image 5](https://m.media-amazon.com/images/I/61QHeuGQSjL.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

### ⭐⭐⭐⭐⭐ Replacing Headlamp Lenses - BMW
*by D***O on 26 February 2026*

Good product! Used this when replacing the headlamp lenses on my BMW F10 (due to condensation). Would use again

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

Used on defender roof gutter rail prior to painting great product

### ⭐⭐⭐⭐⭐ Used to seal an old after market Webasto sunroof!
*by W***N on 7 February 2025*

I had an Peugeot 205 with an after market pop up glass sun roof which after many years started to leak and despite my attempts to revitalise the seals and to try and keep it watertight it simply wouldn't stop leaking. As a replacement was ruinously expensive I decided to look at sealing it up. In the course of browsing a forum I came across the advice that this would be a suitable product to use to seal the sunroof up as it would provide a suitably UV stable rubber type finish to fill the gap between frame and glass. Having acquired the product I popped it into a standard 'gun' with the trigger type mechanism where you keep squeezing on a regular basis to push a plunger into the bottom of the tube to dispense the contents. I broke the metal seal on the tube and screwed the nozzle on having cut a slight angle on the end of it to try and make it easy to dispense the sealant around the edge of the sunroof. The product dispenses fairly well, but in retrospect I should have put some masking tape around the edges of the sunroof and roof as it is very keen on adhering to everything it touches, so you have to be careful if you get too much down as to how you smooth it out. I did wear disposable goves which is certainly a good idea as I got some over the fingers of the gloves in the course of herding it into place. Did it work? Yes, admirably to date which has been nigh on a couple of years now. Once cured it was totally effective in provided the intended sealing affect and has been totally resilient in all weathers.

## 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.sk/products/57255900-sika-sikaflex-521-uv-weathering-resistant-stp-adhesive-sealant-multipurpose](https://www.desertcart.sk/products/57255900-sika-sikaflex-521-uv-weathering-resistant-stp-adhesive-sealant-multipurpose)

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*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-03-10*