

🛠️ Seal the damp, save your space—one coat is all it takes!
Polycell One Coat Damp Seal 500ML is a fast-drying, waterproof sealant designed to stop penetrating damp on interior walls and ceilings. Its matt white finish allows for immediate repainting, making it a convenient and reliable solution for plaster, concrete, and drywall surfaces. Trusted by thousands with a 4.5-star rating, this compact 500ml liquid sealant offers professional-grade protection in a single coat.












| ASIN | B001CJ112Y |
| Best Sellers Rank | 986 in DIY & Tools ( See Top 100 in DIY & Tools ) 30 in Sealers |
| Brand | Polycell |
| Compatible Material | Plaster, Concrete, Drywall |
| Customer Reviews | 4.5 out of 5 stars 3,235 Reviews |
| EU Spare Part Availability Duration | 1 Years |
| Global Trade Identification Number | 05010212505861 |
| Included Components | POLYCELL DAMP SEAL 500ML |
| Item Dimensions | 9 x 10 x 9.9 centimetres |
| Item Form | Liquid |
| Item Type Name | POLYCELL DAMP SEAL 500ML |
| Item Weight | 0.78 Kilograms |
| Item dimensions L x W x H | 9 x 10 x 9.9 centimetres |
| Item height | 9.9 centimetres |
| Item weight | 0.78 Kilograms |
| Manufacturer | ICI Paints Akzo Nobel |
| Material | Silicone |
| Style | Single |
| Style Name | Single |
| Surface Recommendation | Wall |
| Unit Count | 500.0 millilitre |
| Water Resistance Level | Waterproof |
| Water resistance level | Waterproof |
M**N
Looks to be effective.
I’ve applied this to several damp looking areas on a wall in my conservatory prior to re-painting the whole room. Covered the area well. Left it to dry then painted over it without issue. Time will tell t9 see if it has been effective. It has certainly made an immediate impact as the wall is still looking good after four days. Fingers crossed.
A**R
Easy to use
Have used on several rooms around the outside edge of the wall and so far good results, no moisture stain so far
A**G
I recommend it 👌
Value for my money good quality the paint it was easy to use no problem with the smell. The coverage on the wall was ok and I like it. Just hope I the mould do t return in the wi ter will give another up date when the winter kicks in.
R**A
Great paint.
Absolutely great. Used in a bedroom that was really run down and needed completely redoing. The room had a lot of damp and since I’ve used this I’ve not had any problems at all. Says it’s once coat and it most likely is but I used 2 to be sure as it was really damp. One coat with a brush and one with a roller to really pack it onto the wall.
P**Y
Absolutely stops mould and damp in its tracks
This one seal paint is absolutely fantastic! We kept getting patches of mould on the ceiling and wanted a better solution than just spraying mould spray. I put a coat on of this, then went over it with a second coat a few hours after the first had dried. It’s been about 5 weeks now easily and it’s not come back at all! It’s like paint mixed with glue so a smooth roller is needed (like for gloss). Also be super careful when using it, it marks whatever it touches so make sure to keep everything covered and have some thinners to hand. Also eye covering is an absolute must - I got a dried fleck of it stuck in my eye, luckily my eye went crackers and it self resolved - be careful with this stuff. Otherwise it dries quick and decent value for the size. It also does smell abit so good ventilation is needed I think or you’ll get abit of a headache. Would recommend to solve mould issues in the home everytime though.
J**S
My go to damp and stain sealing paint
My go to damp and stain sealing paint - none of that water based rubbish
G**S
Ok...
Ok... didn't work as well as hoped.
S**R
Ok
Ok
Trustpilot
2 weeks ago
2 weeks ago