The Best Damp Seal Paint In The UK Compared

best damp seal paint UK
The best damp seal paint – The presence of water and moisture in a building can lead to damp. This mouldy problem can have a negative impact on your property, leading to discoloured walls and even causing structural damage. 

Damp can also affect your health, and has been linked to respiratory issues, such as asthma. A damp building is a hazard in more ways than one, so how do you guard against the problem? 

You could consider damp proof paint, which is designed to cover signs of damp and act as a barrier against excessive moisture. There are various brands available to buy.

Not sure where to start? Not to worry, we’ve put together this handy guide to the 5 best damp seal paints in the UK.

Our Top 5 Best Damp Seal Paint Currently On The Market

Image
Thompsons Stain Block Damp Seal 2.5L
Polycell Damp Seal
Polar Anti Damp Paint, Damp Proof Paint Stain Blocker Seals in One Coat for Brick, Concrete, Cement and Plaster Walls - Damp Seal Matt Finish (White 1 Litre)
Ronseal OCDSW25L 2.5 Litre One Coat Damp Seal - White
Rustins DAMS250 1-Coat Damp Seal
Performance
Excellent
Excellent
Excellent
Good
Outstanding
Value For Money
Outstanding
Good
Average
Outstanding
Poor
Rating
Reviews
35 Reviews
965 Reviews
91 Reviews
467 Reviews
18 Reviews
Price
£27.49
£17.67
Price not available
£34.79
£6.00
Our Pick
Image
Thompsons Stain Block Damp Seal 2.5L
Performance
Excellent
Value For Money
Outstanding
Rating
Reviews
35 Reviews
Price
£27.49
Best Alternative
Image
Polycell Damp Seal
Performance
Excellent
Value For Money
Good
Rating
Reviews
965 Reviews
Price
£17.67
Image
Polar Anti Damp Paint, Damp Proof Paint Stain Blocker Seals in One Coat for Brick, Concrete, Cement and Plaster Walls - Damp Seal Matt Finish (White 1 Litre)
Performance
Excellent
Value For Money
Average
Rating
Reviews
91 Reviews
Price
Price not available
Image
Ronseal OCDSW25L 2.5 Litre One Coat Damp Seal - White
Performance
Good
Value For Money
Outstanding
Rating
Reviews
467 Reviews
Price
£34.79
Image
Rustins DAMS250 1-Coat Damp Seal
Performance
Outstanding
Value For Money
Poor
Rating
Reviews
18 Reviews
Price
£6.00

Take a look at our top 5 picks to see which brand offers the best performance and value for money.

#1: Thompson TDS25L 2.5L Damp Seal

Thompson TDS25L 2.5L Damp Seal

Check current stock levels, price, and reviews on Amazon

Features:

  • Covers approx. 5 m2 per litre 
  • Can be applied straight to dry or damp ceilings and walls. 
  • Forms a breathable membrane designed to seal moisture 
  • Micro-porous formula causes moisture to evaporate 
  • Does not cause paint to flake or wallpaper to peel
  • One coat is all that’s needed to do the job
  • Dries in 2-3 hours and ready to paint over in approximately 4 hours.

Anything You Should Know? 

  • This product is flammable 
  • May cause dizziness, skin and eye irritation and dry skin. 
  • You can apply with a brush, but a roller might prove to be quicker and easier. 
  • Paint is quite thick so might take some time to apply smoothly. 
Sale
Thompsons Stain Block Damp Seal 2.5L
35 Reviews
Thompsons Stain Block Damp Seal 2.5L
Thompson TDS25L Damp Seal comes in a 2.5 litre tub and is billed as a high-performance interior paint designed to permanently stop the reappearance of damp stains.

#2: Polycell Damp Seal

Polycell Damp Seal

Check current stock levels, price, and reviews on Amazon

Features:

  • Covers and seals damp patches on walls and ceilings 
  • Works with just one coat
  • Matt white finish
  • No need for primer – just use it straight from the tin. 

Anything You Should Know? 

  • This product is flammable
  • May cause dizziness, skin and eye irritation and respiratory issues
  • The paint is very thick (almost glue like in texture)
  • Very strong-scented product so make sure you ventilate the area well
Polycell Damp Seal
965 Reviews
Polycell Damp Seal
This Polycell damp seal paint comes in a 1 litre tin and is formulated to prevent the appearance of damp in your property.

#3: Polar Anti Damp Paint

Polar Anti Damp Paint

Check current stock levels, price, and reviews on Amazon

Features:

  • Available in white or magnolia 
  • Made in Great Britain
  • Apply directly for an instant barrier against penetrating damp 
  • Use on interior walls, windows, door frames, or in the garage
  • Unique solvent based pliolite resin matt coating
  • Cover and seal walls with just one coat
  • Covers 4 m2 per litre 
  • Can be used as a damp-proof primer (before painting with a colour of your choice) or as a topcoat 

Anything You Should Know? 

  • Paint works best when applied to unpainted masonry surfaces
  • Can be applied to previously painted surfaces, but remove old paint first if you can
  • Toxic to aquatic creatures
  • This product may cause respiratory issues, dizziness, skin / eye irritation, and dry skin. 
Polar Anti Damp Paint, Damp Proof Paint Stain Blocker Seals in One Coat for Brick, Concrete, Cement and Plaster Walls - Damp Seal Matt Finish (White 1 Litre)
91 Reviews
Polar Anti Damp Paint, Damp Proof Paint Stain Blocker Seals in One Coat for Brick, Concrete, Cement and Plaster Walls - Damp Seal Matt Finish (White 1 Litre)
Provided in a 1 litre tin, this Polar Anti Damp Paint provides seal and coverage for concrete, brick, plaster and cement walls.

#4: Ronseal One Coat Damp Seal

Ronseal One Coat Damp Seal

Check current stock levels, price, and reviews on Amazon

Features:

  • White in colour
  • As the name suggests, this paint provides cover in just one coat
  • Made by reputable company Ronseal
  • Acts as a permanent barrier 
  • Encourages moisture to evaporate 
  • Causes no damage to walls or surfaces
  • Also works as a primer and can be painted / papered over when dry

Anything You Should Know? 

  • This product is flammable  
  • May cause dizziness and skin irritation. 
Ronseal OCDSW25L 2.5 Litre One Coat Damp Seal - White
467 Reviews
Ronseal OCDSW25L 2.5 Litre One Coat Damp Seal - White
Ronseal One Coat Damp Seal comes in a 750ml tub and is designed to block damp patches and stains.

#5: Rustins DAMS250 1-Coat Damp Seal

Rustins DAMS250 1-Coat Damp Seal

Check current stock levels, price, and reviews on Amazon

Features:

  • Can be used as a primer before being painted or wallpapered over
  • Apply paint directly to dry or damp walls 
  • Facilitates the evaporation of moisture 
  • Prevents flaking paint and peeling wallpaper
  • Dries quickly 
  • Described as high-performance interior paint
  • Permanently covers damp and stains on walls and ceilings 

Anything You Should Know? 

  • This product is flammable 
  • May cause skin irritation 
  • Can be harmful to unborn children 
  • Prolonged exposure can cause health problems e.g. organ damage
  • Strong-smelling product so make sure you ventilate treated areas well
Rustins DAMS250 1-Coat Damp Seal
18 Reviews
Rustins DAMS250 1-Coat Damp Seal
This Rustins 1-Coat Damp Seal comes in a handy 250ml tin. The manufacturers are quick to point out that the paint will not cure a damp problem, but it does provide a durable seal for damp ceilings and walls.

Which Is The Best Damp Seal Paint For You? 

If you’re keen on fixing a damp problem and preventing a reoccurrence of unpleasant mould damp seal paint could be the answer. The manufacturers of each of the five products we have listed above claim that their particular brand can help your fight against damp.

So how will you choose the best damp seal paint for you?

We suggest you consider what each paint has to offer.Thompson TDS25L Damp Seal comes in a large tub, can be applied straight to dry or damp ceilings and walls and provides great one-coat coverage. Similarly, Polycell damp seal paint can also be used straight from the tin.

Polar Anti Damp Paint is a versatile product that can be used on plaster, cement, concrete and brick. We also have Ronseal One Coat Damp Seal in the running, made by a reputable company and proclaiming to cover without causing damage to walls or surfaces.

Finally, there’s Rustins 1-Coat Damp Seal which dries quickly and is described as a permanent barrier against damp. 

Whist each damp seal paint claims to provide the same comprehensive coverage and act as a durable barrier against moisture, not all damp seal paints are equal!

Check out the prices, reputation of the manufacturer and the size of the tin to make sure you are getting the best deal for your money. 

How Does Damp Seal Paint Work? 

Damp seal paint generally contains a strong water-reactive component designed to combat moisture. This durable paint works well in buildings prone to damp problems but just slapping it onto your walls and ceilings won’t be enough to solve all damp issues.

In order to maximise the effectiveness of your damp seal paint you should carefully follow the instructions provided, which usually look something like this:

  1. Clean the area thoroughly. Use a moist cloth or sponge and methodically wipe the area removing existing damp patches, stains, dust and dirt from walls and ceilings. Clean again if necessary, with another clean cloth and then allow the area to dry completely. 
  2. Paint on your damp seal paint with a brush or roller. This needs to be done carefully – don’t rush. Follow all safety precautions, ventilate the room and keep children and pets out of harm’s way.

    Make sure the paint is applied smoothly and allow to dry. If you are using a one-coat paint this should do the trick. However, you can apply a second coat if you feel the wall or ceiling needs it. 
  3. Redecorate. Are you painting or papering over the top of your damp seal paint? If so now’s the time to get out your regular paint or pretty-patterned wallpaper and get decorating!

How Long Does Damp Proof Paint Last?

Loose, cracking paint

Many manufacturers define their damp-proof paint as long-lasting, but the results can vary, depending on the type and severity of damp you are trying to deal with.

Damp proof paint should not be used to mask a problem, it should be used as a preventative measure to decrease the risk of reoccurrence. 

You will have to tackle the problem at source before you slap on the paint, and you do need to make sure you do the job properly. Think about the wall or ceiling you are applying the paint to – if it’s not clean and you haven’t attempted to remove damp stains etc how can you expect the paint to work for a lengthy time? 

Can You Paint Over Damp Seal?

Damp seal paint often comes in white (or maybe magnolia), but if that doesn’t suit your room you will probably want to paint over it – that’s fine! Once your damp seal paint is dry you can choose any colour you wish and get painting, you can even wallpaper over it if you like! 

Does Damp Seal Paint Stop Mould?

One coat damp seal paint has been formulated to seal damp patches on ceilings and walls, and as they name implies – it’d designed to do it in just one coat. If you follow the instructions and prep your walls correctly before-hand, damp seal paint should reduce the risk of damp reoccurring. 

How Long Does It Take Damp Seal Paint To Dry Out?

This can vary from brand to brand. Some can dry in as little as 2-3 hours and be ready to paint or paper over in approximately 4 hours. The one coat paint should do as it says on the tin (one coat should be enough), but in certain cases you might prefer to apply an additional coat. 

Does Damp Proof Paint Really Work? 

does damp seal paint work?

There’s been some debate as to the effectiveness of damp seal paint, so let’s try and clarify. In a nutshell, damp seal paint does work when it’s used in the correct way and for the correct purpose. 

There’s no point slapping on damp seal paint and expecting it to solve all your troubles! Damp seal paint may stop damp from damaging your decor but you still need to identify the root cause of the problem. If you have a serious issue, such as rising damp, simply washing down walls and repainting won’t put everything right.

Rising damp is more than just a touch of mildew or mould, it’s indicative of an underlying condition that will reoccur unless moisture is prevented from rising and entering the walls.

However, for less severe cases of damp, this type of paint seems to be a popular remedy. Reviews indicate that damp proof paint is relatively easy to use, and the majority of people who have used it seem happy with the results. Here’s what people have to say: 

“Had some trouble re damp that just wouldn’t dry out, applied this and found the damp reduced to reasonable levels on damp meter, we were then able to overcoat this and have been fine since. (3 months). Very good product.”

Verified Amazon Review

“Works very well and holds in the damp extremely well. Just ensure that you repair the cause of the problem first.”

Verified Amazon Review

“Having an old cottage where the weather sneaks in wherever it can, I found a coat of this Damp Seal really helped. You can put it on new plaster or over emulsion. I found 2 coats by roller was better and quicker than 1 by brush.It may be a bit pricey but well worth it.”

Verified Amazon Review

The Tell-Tale Signs That You Have Damp 

If you’re worried you might have a damp problem it’s worth giving your place a once over. Here are a few tell-tale signs to look out for:

Walls

Check your walls for damp by placing your hand flat against it. Damp walls tend to feel moist and very cold. You might also notice speckled dark marks or even small growths protruding from the wall, which can also be a sign of damp. Peeling wallpaper and flaking paint can also indicate a problem. 

Ceilings 

Look out for discoloured or stained areas forming – particular hot spots include chimney breasts and the corners of the room.

Windows

Are your windows wet with condensation or are puddles forming on your sills? This could be sign of excess moisture – as can black speckles on your window frames. 

Rooms 

A musty smell can indicate the presence of damp. Look at grouting and seals, if they are noticeably black you might have a problem. Check inside cupboards too for stains.

Mould can also grow on blinds and curtains, and don’t forget to check behind the sofa! Damp can creep into all sorts of places. 

The Best Damp Seal Paint In The UK

Image
Thompsons Stain Block Damp Seal 2.5L
Polycell Damp Seal
Polar Anti Damp Paint, Damp Proof Paint Stain Blocker Seals in One Coat for Brick, Concrete, Cement and Plaster Walls - Damp Seal Matt Finish (White 1 Litre)
Ronseal OCDSW25L 2.5 Litre One Coat Damp Seal - White
Rustins DAMS250 1-Coat Damp Seal
Performance
Excellent
Excellent
Excellent
Good
Outstanding
Value For Money
Outstanding
Good
Average
Outstanding
Poor
Rating
Reviews
35 Reviews
965 Reviews
91 Reviews
467 Reviews
18 Reviews
Price
£27.49
£17.67
Price not available
£34.79
£6.00
Our Pick
Image
Thompsons Stain Block Damp Seal 2.5L
Performance
Excellent
Value For Money
Outstanding
Rating
Reviews
35 Reviews
Price
£27.49
Best Alternative
Image
Polycell Damp Seal
Performance
Excellent
Value For Money
Good
Rating
Reviews
965 Reviews
Price
£17.67
Image
Polar Anti Damp Paint, Damp Proof Paint Stain Blocker Seals in One Coat for Brick, Concrete, Cement and Plaster Walls - Damp Seal Matt Finish (White 1 Litre)
Performance
Excellent
Value For Money
Average
Rating
Reviews
91 Reviews
Price
Price not available
Image
Ronseal OCDSW25L 2.5 Litre One Coat Damp Seal - White
Performance
Good
Value For Money
Outstanding
Rating
Reviews
467 Reviews
Price
£34.79
Image
Rustins DAMS250 1-Coat Damp Seal
Performance
Outstanding
Value For Money
Poor
Rating
Reviews
18 Reviews
Price
£6.00
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