---
product_id: 54955287
title: "– Sika Sikaflex 521 UV – Weathering Resistant Silane Terminated Polymer Adhesive Sealant – Age Resistant – Low Odour – Overpaintable – Black – 300ml"
brand: "sika"
price: "₨16234"
currency: LKR
in_stock: true
reviews_count: 13
category: "Sika"
url: https://www.desertcart.lk/products/54955287-sika-sikaflex-521-uv-weathering-resistant-silane-terminated-polymer-adhesive
store_origin: LK
region: Sri Lanka
---

# overpaintable & sandable finish weather & age resistant formula 300ml professional-grade cartridge – Sika Sikaflex 521 UV – Weathering Resistant Silane Terminated Polymer Adhesive Sealant – Age Resistant – Low Odour – Overpaintable – Black – 300ml

**Brand:** sika
**Price:** ₨16234
**Availability:** ✅ In Stock

## Summary

> 🖤 Seal it like a pro — weatherproof, paint-ready perfection!

## Quick Answers

- **What is this?** – Sika Sikaflex 521 UV – Weathering Resistant Silane Terminated Polymer Adhesive Sealant – Age Resistant – Low Odour – Overpaintable – Black – 300ml by sika
- **How much does it cost?** ₨16234 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.lk](https://www.desertcart.lk/products/54955287-sika-sikaflex-521-uv-weathering-resistant-silane-terminated-polymer-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

- • **Flawless Finish:** Sandable and overpaintable for a sleek, invisible seal that blends perfectly with your project.
- • **Clean & Comfortable:** Low-odour, isocyanate and solvent-free formula keeps your workspace fresh and safe.
- • **Pro-Grade Durability:** Engineered for professionals to deliver long-lasting, weatherproof bonds that stand the test of time.
- • **Multi-Surface Mastery:** Seamlessly bonds timber, metals, ceramics, plastics, and more—no special pre-treatment needed.
- • **Indoor & Outdoor Ready:** Versatile black sealant designed to perform brilliantly in both internal and external environments.

## Overview

Sika Sikaflex 521 UV is a 300ml professional-grade silane terminated polymer adhesive sealant, designed for durable, weather and age-resistant bonding on multiple substrates including timber, metals, ceramics, and plastics. Its low-odour, solvent-free formula requires no special surface prep and offers a sandable, overpaintable finish ideal for both indoor and outdoor applications.

## Description

Shop Sika Sikaflex 521 UV – Weathering Resistant Silane Terminated Polymer Adhesive Sealant – Age Resistant – Low Odour – Overpaintable – Black – 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.
- SUITABLE FOR USE ON MULTIPLE SUBSTRATES – Use it to bond or seal various materials, including timber, metals, metal primers and paint coatings (2-component systems), ceramic materials and plastics.
- IDEAL FOR INTERNAL AND EXTERNAL USE – Isocyanate and solvent-free black adhesive and sealant ideal for multiple applications.
- NO SPECIAL PRE-TREATMENTS REQUIRED – Bonds and seals a wide variety of materials with no need for special pre-treatments.
- LONG LASTING – Sikaflex 521 UV black is age and weathering-resistant, delivering a bond that lasts.
- HIGH QUALITY FINISH – Both sandable and overpaintable to enable you to create a seamless look whatever the job.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00BEFI8EA |
| Batteries | Lithium Metal batteries required. |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 5,029 in DIY & Tools ( See Top 100 in DIY & Tools ) 1 in Adhesive Caulk |
| Colour | Black |
| Customer Reviews | 4.6 4.6 out of 5 stars (1,688) |
| Date First Available | 18 Aug. 2013 |
| Included components | 1 cartridge |
| Item Package Quantity | 1 |
| Item Weight | 417 g |
| Item model number | 60179 |
| Manufacturer | Sika |
| Material | Polyurethane Silicone silicone Polyvinyl chloride |
| Number of Pieces | 1 |
| Part number | 60179 |
| Product Dimensions | 5 x 5 x 21 cm; 417 g |
| Size | 300ml |
| Special Features | Black |
| Specific uses | Professional |
| Style | Sika Flex-521 UV (old version) |
| Volume | 300 Millilitres |

## Product Details

- **Brand:** Sika
- **Colour:** Black
- **Full cure time:** 168 Hours
- **Item weight:** 0.42 Kilograms
- **Liquid volume:** 300 Millilitres

## Images

![– Sika Sikaflex 521 UV – Weathering Resistant Silane Terminated Polymer Adhesive Sealant – Age Resistant – Low Odour – Overpaintable – Black – 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 Silane Terminated Polymer Adhesive Sealant – Age Resistant – Low Odour – Overpaintable – Black – 300ml , Pack of 1
- Sika Sikaflex-522 Caravan And Motorhome Adhesive Sealant – Weather And Mould Resistant – White – 300ml
- LLPT Butyl Seal Putty Tape | for Leak Proof RV Repair Window Glass Boat Sealing EPDM Roof Patching (BST343) | Black | 3MM Thick x 19MM Wide x 10M Long

---

## 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.lk/products/54955287-sika-sikaflex-521-uv-weathering-resistant-silane-terminated-polymer-adhesive](https://www.desertcart.lk/products/54955287-sika-sikaflex-521-uv-weathering-resistant-silane-terminated-polymer-adhesive)

---

*Product available on Desertcart Sri Lanka*
*Store origin: LK*
*Last updated: 2026-03-02*