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🔇 Seal the noise out, lock the comfort in!
Everbuild Everflex AC50 is a premium 380 ml white acrylic sealant and adhesive designed for professional use. It offers high strength and permanent flexibility, certified acoustic barrier performance to S EN ISO 140/3, and resistance to mould and moisture. Ideal for bonding plasterboard, wood, metal, and blockwork, it applies easily with standard caulking guns and is overpaintable, making it the go-to solution for soundproofing and sealing in modern construction.







| ASIN | B0012RLYJ6 |
| Best Sellers Rank | 7,072 in DIY & Tools ( See Top 100 in DIY & Tools ) 160 in Sealers |
| Brand | Sika |
| Colour | White |
| Compatible Material | Plasterboard, Kraft Lined Insulation Boards, Common Substrates, Most Surfaces |
| Customer Reviews | 4.3 out of 5 stars 524 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 |
| Number of Packs | 1 |
| Style | Compact |
| Style Name | Compact |
| Surface Recommendation | Wall |
| Unit Count | 380.0 millilitre |
| Water Resistance Level | Water Resistant |
| Water resistance level | Water Resistant |
A**R
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
M**4
Best sealant on the market
Great sealant
S**S
Did the job
This doesn't fit the standard size gun so be aware of that. I had to cut mine down to fit in my caulking gun. It adhered well and was easy to spread and fill the edges of the area I'm trying to reduce excess sound. It doesn't last very long and the nozzles it comes with seem to "waste" a large amount of filler in the tube.
J**N
it Does what it Does
Does exactly the job it was intended to do. Tube is actually longer that standard tube but it should fit any standard gun fine.
D**L
Wow
So I bought this with little expectations, as the gap around my window was minor so didn't expect much of a change.. after using it, it has changed the room. Quieter, warmer and sticks just like caulk, easy to use and can be painted over- worth every penny. Really good stuff!
S**Y
Good
Now my windows are quiet and less drafty
J**X
You'll probably need more!
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.
M**H
Curing is too delayed
Not as great as its states, settling time is too long in winter. I have applied day before and its still not set
M**L
Funciona correctamente.
Lo compre sabiendo lo que era. Cumple con su función.Lo utilice para sellar marcos de ventanas que venían sin sellar de obra.
C**N
tube de grand model . souple et facile a poser
mastic acoustique blanc pour isolation phonique entre deux matériaux
Trustpilot
2 weeks ago
1 month ago