---
product_id: 51302969
title: "Everbuild Everflex AC50 Contract Acoustic Sealant and Adhesive, White, 380 ml"
brand: "sika"
price: "€ 31.25"
currency: EUR
in_stock: true
reviews_count: 8
category: "Sika"
url: https://www.desertcart.sk/products/51302969-everbuild-everflex-ac50-contract-acoustic-sealant-and-adhesive-white-380
store_origin: SK
region: Slovakia
---

# Acoustic & intumescent barrier Non-flammable & mould resistant 380 ml high-grip sealant Everbuild Everflex AC50 Contract Acoustic Sealant and Adhesive, White, 380 ml

**Brand:** sika
**Price:** € 31.25
**Availability:** ✅ In Stock

## Summary

> 🔧 Seal smart, soundproof sharp, and stay safe in style!

## Quick Answers

- **What is this?** Everbuild Everflex AC50 Contract Acoustic Sealant and Adhesive, White, 380 ml by sika
- **How much does it cost?** € 31.25 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/51302969-everbuild-everflex-ac50-contract-acoustic-sealant-and-adhesive-white-380)

## 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

- • **Acoustic & Intumescent Seal:** Effectively seals gaps to reduce noise and enhance fire protection—upgrade your space’s comfort and safety.
- • **Overpaintable & Easy Cleanup:** Smooth finish that accepts paint and cleans up effortlessly, perfect for professional-grade results.
- • **Permanently Flexible, High Grab:** Adheres seamlessly to plasterboard, wood, metal & blockwork for durable, lasting bonds.
- • **Water Resistant & Mould Resistant:** Built to withstand moisture and prevent mould growth, ensuring longevity in any environment.
- • **Compatible with Standard Caulking Guns:** Ready to use with common skeleton guns, no hassle, no delays—get the job done right the first time.

## Overview

Everbuild Everflex AC50 is a 380 ml white acrylic sealant and adhesive designed for professional use. It offers permanent flexibility with high grab strength, bonding plasterboard, wood, metal, and blockwork. This water-resistant, mould-resistant, and non-flammable sealant forms an acoustic and intumescent barrier, reducing noise and enhancing fire safety. Overpaintable and easy to clean, it fits standard caulking guns for efficient application.

## Description

Shop Everbuild Everflex AC50 Contract Acoustic Sealant and Adhesive, White, 380 ml. Free delivery on eligible orders of £20 or more.

Review: Good stuff 👏 - I had some hesitation because other reviewers said it didn't fit in a culking gun - they do in fact fit in a normal size skeleton/caulking gun. Someone else mentioned not getting nozzles, i got 3 nozzles with 3 tubes as expected. The sealant itself was easy to use when sealing round insulated plasterboard. I also used it as frame sealant around the window/plasterboard joints and round sill. Tooled off and cured really nicely. Between this sealant and insulated plasterboard the room is warmer and a little quieter. Will use again
Review: A good priced product and met with my expectations - A good item which did the job just what I expected.

## Features

- Contains a mixture of 5-Chlor-2-methyl-2H-isothiazol-3-on und 2-Methyl-2H-isothiazol-3-on (3:1) (CIT/MIT). May produce an allergic reaction.
- Suspected of damaging fertility or the unborn child.
- Ac50 is permanently flexible with high grab will adheres to most surfaces whilst being mould resistant and non flammable
- When cured it can be over paintable and is easy to clean up
- Ac50 will form an acoustic and intumescent barrier by sealing gaps between plasterboard walls, floors and ceilings
- Ac50 bonds plasterboard to plasterboard, wood, metal studding and direct to block work

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0012RLYJ6 |
| Best Sellers Rank | 11,994 in DIY & Tools ( See Top 100 in DIY & Tools ) 251 in Sealers |
| Brand | Sika |
| Colour | White |
| Compatible Material | Metal |
| Customer Reviews | 4.2 out of 5 stars 508 Reviews |
| Global Trade Identification Number | 05029347600358, 05029347903268 |
| Item Dimensions | 32 x 38 x 254 millimetres |
| Item Form | Paste |
| Item Weight | 0.64 Kilograms |
| Item dimensions L x W x H | 32 x 38 x 254 millimetres |
| Item weight | 0.64 Kilograms |
| Manufacturer | Sika Everbuild |
| Manufacturer Contact Information | Sika Everbuild 41 Knowsthorpe Way, Leeds LS9 0SW |
| Manufacturer Part Number | AC50C4 |
| Material | Acrylic |
| Model Number | AC50C4 |
| Number of Items | 12 |
| Style | Compact |
| Style Name | Compact |
| Surface Recommendation | Wall |
| Unit Count | 380.0 millilitre(s) |
| Water Resistance Level | Water Resistant |
| Water resistance level | Water Resistant |

## Product Details

- **Brand:** Everbuild
- **Item dimensions L x W x H:** 32 x 38 x 254 millimetres
- **Item weight:** 0.64 Kilograms
- **Material:** Acrylic
- **Style:** Compact

## Images

![Everbuild Everflex AC50 Contract Acoustic Sealant and Adhesive, White, 380 ml - Image 1](https://m.media-amazon.com/images/I/51EMqYoGsUL.jpg)

## Questions & Answers

**Q: Is the can 400 ml or 900 ml?**
A: This is the C4 400ml tube.

**Q: Could I use this to attach sound proofing matt directly to a plaster board wall? Thanks in advance for any help offered**
A: Yes, it's not only a flexible sealant but it's also an adhesive specifically formulated for sealing and bonding plasterboard and other Kraft lined insulation boards.

**Q: Is this 100% silicone?**
A: Not like any 100% silicone I have ever used.     It is more like a mud  but unlike silicone does not cure throughout the bead.      It has a cure on the outside crust but has an elastic type slower cure in the middle to allow for acoustic bounce and absorption.    I have removed some previous acoustic work and the beading is still tacky on the thicker beads after many months following installation.    It does grab however I would not trust it to hold any weighty objects

**Q: Can i use on the outside of my shed to seal gaps between wood joints?**
A: No. Sorry it will dissolve and run off in rain.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good stuff 👏
*by A***R on 10 May 2023*

I had some hesitation because other reviewers said it didn't fit in a culking gun - they do in fact fit in a normal size skeleton/caulking gun. Someone else mentioned not getting nozzles, i got 3 nozzles with 3 tubes as expected. The sealant itself was easy to use when sealing round insulated plasterboard. I also used it as frame sealant around the window/plasterboard joints and round sill. Tooled off and cured really nicely. Between this sealant and insulated plasterboard the room is warmer and a little quieter. Will use again

### ⭐⭐⭐⭐ A good priced product and met with my expectations
*by A***R on 4 October 2020*

A good item which did the job just what I expected.

### ⭐⭐⭐⭐⭐ You'll probably need more!
*by J***X on 13 October 2020*

I used it to assist in the construction of a 'soundproof' room. Easy to use and smooth down before it cures. Although waterbased? product can irritate sensitive skin. Worked great for sealing uneven joints between walls, ceilings and studwork. Coverage is fair though I found I needed more than was estimated for to complete the job. Can be used as an adhesive to attach plasterboard to fixings though I didn't use it for load bearing areas. Mainly used to seal joints between boards before taping and finishing. Can be easily painted over. Says you can 'sand it down' you can but very time consuming! More than happy to recommend this product and I would buy it again for a similar project/job.

## Frequently Bought Together

- Everbuild Everflex AC50 Contract Acoustic Sealant and Adhesive, White, 380 ml
- Advanced Acoustics Premium Mass Loaded Vinyl Soundproofing Mat - 1.25m x 3m - 5kg/sqm - 2mm Thin
- Everbuild Stick 2 All Purpose High Bond Strength Contact Spray Adhesive, 500 ml, Beige

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**Shop now:** [https://www.desertcart.sk/products/51302969-everbuild-everflex-ac50-contract-acoustic-sealant-and-adhesive-white-380](https://www.desertcart.sk/products/51302969-everbuild-everflex-ac50-contract-acoustic-sealant-and-adhesive-white-380)

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*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-03-19*