---
product_id: 57255900
title: "Sikaflex 521 UV – Weathering Resistant STP Adhesive Sealant – Multipurpose – Low Odour – Age And Weather Resistant – Light Grey – 300ml"
brand: "sika"
price: "$67"
currency: NZD
in_stock: true
reviews_count: 8
category: "Sika"
url: https://www.desertcart.nz/products/57255900-sikaflex-521-uv-weathering-resistant-stp-adhesive-sealant-multipurpose-low
store_origin: NZ
region: New Zealand
---

# 30 min full cure time Weather & age resistant Multipurpose adhesion Sikaflex 521 UV – Weathering Resistant STP Adhesive Sealant – Multipurpose – Low Odour – Age And Weather Resistant – Light Grey – 300ml

**Brand:** sika
**Price:** $67
**Availability:** ✅ In Stock

## Summary

> 🔗 Seal the deal with lasting strength and style!

## Quick Answers

- **What is this?** 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?** $67 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/57255900-sikaflex-521-uv-weathering-resistant-stp-adhesive-sealant-multipurpose-low)

## 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

- • **Seamless Finish Ready:** Sandable and paintable once cured, blending perfectly with your design vision.
- • **Fast & Reliable Bonding:** Achieve full cure in just 30 minutes for quick project turnaround.
- • **Low Odour, High Comfort:** Solvent-free formula ensures a safer, more pleasant working environment.
- • **Built to Brave the Elements:** Superior resistance to ageing and weathering keeps bonds intact indoors and out.
- • **Versatile Application Power:** Bonds timber, metals, ceramics, plastics—no primer needed, saving prep time.

## Overview

Sika Sikaflex 521 UV is a professional-grade, weather-resistant STP adhesive sealant in light grey, designed for multipurpose use on diverse materials. It cures fully in 30 minutes, offering durable, flexible bonds that resist ageing and weathering. Its low-odour, solvent-free formula is safe to sand and paint, making it ideal for both interior and exterior applications.

## 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 |
| Best Sellers Rank | 11,489 in DIY & Tools ( See Top 100 in DIY & Tools ) 3 in Adhesive Caulk |
| Brand | Sika |
| Colour | Light Grey |
| Country Of Origin | Switzerland |
| Customer Reviews | 4.6 out of 5 stars 1,682 Reviews |
| Full Cure Time | 3E+1 Minutes |
| Full cure time | 3E+1 Minutes |
| Global Trade Identification Number | 07612894184518 |
| Included Components | 1 cartridge |
| Item Form | Paste |
| Item Type Name | Sealant and Adhesive |
| Item Weight | 0.42 Kilograms |
| Item form | Paste |
| Item weight | 0.42 Kilograms |
| Liquid Volume | 300 Millilitres |
| Liquid volume | 300 Millilitres |
| Manufacturer | Sika |
| Material | Polyurethane Silicone silicone Polyvinyl chloride |
| Product Warranty | Product guarantees 0 months. |
| Surface Recommendation | Door, Metal, Pipe, Wood |
| Unit Count | 300.0 millilitre(s) |
| Water Resistance Level | Water Resistant |

## Product Details

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

## Images

![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)

## Available Options

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

## 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

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

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

---

*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-02-11*