Concrete floor with waterproof paint

Waterproof coatings for preventing damp

Waterproofing spaces and surfaces does not need to be difficult. However, due to the wide scale of products and applications it is wise to do some research on which waterproof paint or coating is the best for your specific project. In this article you will find information on the most common waterproof coating applications and independent advice on suitable products.

Waterproof paint refers to coating products which prevent water penetration on the substrate. Waterproof coatings can be for example:

  • Liquid rubber coatings
  • Nano coatings (hydrophobic)
  • 2 component PU paint
  • 2K epoxies

Waterproof coating can be applied on brick walls

Use waterproof coatings on almost any surface type

Most waterproof paints are suitable for porous materials such as:

  • Wood
  • Brickwork & Masonry
  • Concrete
  • Plaster & Bonded render

The coatings are often applicable on vertical and horizontal surfaces, thus walls, floors and ceilings. They are ideal for areas where exposure to water, damp or steam is likely. Therefore, the ideal applications include for example:

  • Tunnels
  • Basements
  • Interior & Exterior walls
  • Interior & Exterior floors

Not only does waterproof paint protect from water penetrating the surface but it also prevents steam and damp from reaching the underlying material.

Benefits of waterproof paint

There are several reasons for waterproof coatings being popular. The main benefits include the following ans they are true for most of the products, yet not for all of them:

  • For interiors and exteriors
  • Applicable on damp surfaces
  • Over coating is possible
  • User friendly; easy to apply, non-toxic, low odour
  • Can be applied to damp surfaces
  • Allows the substrate to breathe
  • Fills gaps and cracks where needed
  • Resists pressure when correctly applied (pressure resistance is highly dependent on the product)

Make wood waterproof

Waterproof paint for your bathroom

A coating is not a tile, and can thus not guarantee the same durability. There are however, many waterproof paints which are suitable for in the bathroom and shower cubical. For example shower cubical walls with a concrete-look can perfectly be coated with a clear waterproof coating which preserves the looks but does not let water affect the surface. Here are some examples of different waterproof coatings for in the bathroom:

  • Dulux Bathroom Plus | 2.5 L | £20.00 |  13 sq m / litre | wall paint ideal for creating a contemporary and smooth look for bathrooms.
  • Rust-Oleum Tub & Tile | 940 ml | £30.10 | 4-6 sq m / litre| 2K, epoxy acrylic finish for refinishing ceramic tiles and porcelain, fiberglass and cast iron bath tubs and sinks.  4-6.
  • Zinsser WaterTite | 5 L | £72.67 | 2 sq m / litre | A waterproof paint which keeps water out, contains a biocide that protects substrate from fungal degradation for a minimum of 5 years.

Guidelines for before applying

  • Before applying a waterproof coating in the bathroom, you should first apply an epoxy or another primer to guarantee the best end result.
  • If you are coating a very humid area, choose for a 2 component epoxy primer and a 2 component topcoat.
  • You need more paint for floors than for the same area on walls.
  • Apply two thin  layers of topcoat instead of one thick layer to reach a neat and more durable end result.
  • Avoid damp from concrete substrates; depending on the coating, the concrete should be 3 to 6 weeks old.
  • Before applying any coatings, study the technical data sheets provided by the coating manufacturer.

Waterproof masonry paint

Masonry is a common material on facades, however, it is porous and tends to absorb water without an appropriate coating. Therefore, there are several products for waterproofing masonry on exterior walls.

  • Rust-Oleum Murfill | 6 Kg | £56.29 | 1.5 – 3 sq m / kg | a waterproofing coating for almost any exterior wall including masonry.
  • Sandtex Microseal Smooth Masonry Paint | 2.5 L | £19.00 |16 sq m / litre | Dirt resistant, breathable and waterproof masonry paint.

Commercial and industrial waterproof paint applications

Waterproof coatinhgs are also widely used in industrial and commercial buildings. For example the following applications are possible with most waterproof paints. However, it is crucial to make sure that the specific paint is suitable.

  • Tanking cellars and basements to resist ground water permeation
  • Damp proofing subways and tunnels
  • Lining tunnels, silos and irrigation channels
  • Retaining walls and lift shafts
  • Vehicle maintenance pits
  • Industrial kitchens
  • Swimming pools prior to tiling or painting

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