---
product_id: 213661978
title: "Sikaflex 521 UV – Weathering Resistant STP Adhesive Sealant – Multipurpose – Low Odour – Age and Weather Resistant – Light Grey – 300ml"
brand: "sika"
price: "VT16370"
currency: VUV
in_stock: true
reviews_count: 5
category: "Sika"
url: https://www.desertcart.vu/products/213661978-sikaflex-521-uv-weathering-resistant-stp-adhesive-sealant-multipurpose-low
store_origin: VU
region: Vanuatu
---

# 24h full cure time Age & weather resistant 1-component STP formula Sikaflex 521 UV – Weathering Resistant STP Adhesive Sealant – Multipurpose – Low Odour – Age and Weather Resistant – Light Grey – 300ml

**Brand:** sika
**Price:** VT16370
**Availability:** ✅ In Stock

## Summary

> 🔧 Seal it like a pro — durable, flexible, and ready for anything!

## 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?** VT16370 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/213661978-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

- • **Multi-gun compatible:** Apply with hand, pneumatic, or electric piston guns effortlessly.
- • **Flexible & weatherproof:** Stays resilient indoors and out, resisting cracks and wear.
- • **Primer-free versatility:** Bond timber, metal, ceramics & plastics without extra prep.
- • **Low-odour, safe application:** Solvent-free and paintable for a clean, hassle-free finish.
- • **Professional-grade durability:** Engineered for pros, built to last through time and elements.

## Overview

Sika Sikaflex 521 UV is a professional-grade, multipurpose STP adhesive sealant in light grey, designed for primer-free bonding on diverse materials. It cures in 24 hours to a flexible, weather-resistant finish that can be sanded and painted. Ideal for both interior and exterior use, it offers low odour application and compatibility with various piston guns, ensuring a durable, long-lasting seal.

## Description

Need a multipurpose sealant and adhesive for your construction work? Sikaflex 521 is a light grey adhesive sealant designed for use without primers and minimal preparation. The durable formula is crafted using 1-component Silane Terminated Polymer (STP) and cures to a flexible finish in ambient moisture. Use this low-odour formula inside and outside on timber, metals, metal primers and paint coatings, ceramic materials and plastics for a long-lasting, durable finish resistant to ageing and weathering. Apply using a hand, pneumatic or electric-driven piston gun, and it should cure in 24 hours. Once dry, sand or paint over it for a professional finish. Also available in white and black.

Review: Works well. Recommend
Review: Ottimo prodotto. Io l'ho comprato x eseguire alcune sigillature sul camper ma ho scoperto che è ottimo anche per l'incollaggio di componenti staccati in un gommone. Ottima resistenza anche alla trazione.

## Features

- 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 | #288,269 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #684 in Adhesive Caulk #1,161 in Industrial Sealants #121,557 in Hardware |
| Brand | SIKA |
| Color | Light Gray |
| Customer Reviews | 4.5 4.5 out of 5 stars (1,444) |
| Date First Available | November 10, 2013 |
| Full Cure Time | 24 Hours |
| Global Trade Identification Number | 07612894184518 |
| Item Form | Paste |
| Item Weight | 14.8 ounces |
| Item model number | 512UV |
| Liquid Volume | 300 Milliliters |
| Manufacturer | Sika |
| Manufacturer Part Number | 62139 |
| Material | Silane Terminated Polymer |
| Model | Sikaflex |
| Number of Items | 1 |
| Product Dimensions | 1.97 x 1.97 x 8.27 inches |
| Surface Recommendation | Door, Metal, Pipe, Wood |
| Unit Count | 10.1442 Fluid Ounces |
| Water Resistance Level | Waterproof |

## Product Details

- **Brand:** SIKA
- **Color:** Light Gray
- **Full Cure Time:** 24 Hours
- **Item Weight:** 0.42 Kilograms
- **Liquid Volume:** 300 Milliliters

## 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/6173Cv7FCvL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by S***3 on January 22, 2026*

Works well. Recommend

### ⭐⭐⭐⭐⭐ Review
*by A***I on August 3, 2020*

Ottimo prodotto. Io l'ho comprato x eseguire alcune sigillature sul camper ma ho scoperto che è ottimo anche per l'incollaggio di componenti staccati in un gommone. Ottima resistenza anche alla trazione.

### ⭐⭐⭐⭐⭐ Review
*by M***S on October 7, 2025*

Wie zu erwarten, Sika. Es hält was es verspricht. Klasse Ware

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*Product available on Desertcart Vanuatu*
*Store origin: VU*
*Last updated: 2026-03-10*