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Polyurea Coating


A polyurea coating is a protective layer or lining applied to various surfaces. It is used to create a strong flexible barrier which protects buildings from water damage, corrosion, abrasion and chemical exposure. A polyurea coating is a formula derived from a combination of  isocyanates and resin blends. It is a material known for possessing excellent durability and the versatility to perform across a variety of applications. Polyurea coatings have rapid curing times and a fast installation process. This has been proven to hold true even in challenging weather conditions.

Polyurea coatings are often used in industrial and commercial settings. These coatings are normally used to protect surfaces like concrete and steel. The purpose here is to provide resistance to water, chemicals, impact, and extreme temperatures. Polyurea coatings form a seamless and watertight protective layer. This has made polyurea coatings a popular choice in a range of applications, including; roofs, flooring, tanking, and pipeline waterproofing.


At RJ Evans, we have a specialist polyurea coating team. We can provide polyurea coatings for; waterproofing roofs, flooring, decking, walkways and much more. Whatever your need a polyurea coating for we can help. If you like some advice or a quotation you can get in touch through our contact form or call us now on 01277 375 511.

What Is A Polyurea Coating?

A polyurea coating is a lining and joint sealing technology used in construction. This unique coating is a tough synthetic polymer technology1 has several advantages which make it perfect for waterproofing. It has water tight qualities, excellent chemical resistance and abrasion resistance. Coatings with polyurea are durable boasting excellent tensile strength and tear resistance.

This excellent tensile strength 2 makes a polyurea coating systems a unique coating system. The reason for this is a polyurea coating unlike nearly all liquid systems does not require to be reinforced with chopped strand matting. It also performs better than epoxy coatings, polyurethane and traditional coatings.

The benefit of polyurea’s tear resistance makes any surface it coats suitable to endure heavy foot traffic. This is another feature which makes polyurea protective coatings stand out when compared to other waterproofing systems such as EPDM rubber. Furthermore, polyurea is a completely liquid system so not only will there be a seamless finish it will also easily waterproof notoriously hard details on flat roofs, flooring and other applications. Such details include plant machinery, soil vent pipes, skylights and air vents.

Polyurea coatings also boasts low "Volatile Organic Compounds" (VOC's)4 and produces no toxic fumes. With a polyurea coating you can receive a guarantee of up to 25 years depending on the application.

Polyurea is truly one of the best waterproofing systems on the market. In many ways, it rivals ‘The King of Waterproofing’ mastic asphalt. And it is significantly cheaper than mastic asphalt due to a significantly shorter installation process. If you are looking for a highly reliable waterproofing system, which is budget friendly a polyurea coating might just be what you are looking for.

The Benefits Of Using Polyurea Coating Systems

• Fast Installation Which Minimises Disruption

• Applying Polyurea Is Cost Effective (especially when spray applied)

• Seamless Finish

• High Tensile Strength

• Excellent Tear Resistance

• Watertight Qualities Makes a Polyurea Coating Excellent for waterproofing

• Polyurea Coatings Do Not Require Reinforcement With Chopped Strand Matting

• Excellent For Complex Detailing

• A Polyurea Coating Can Endure Heavy Foot Traffic

• Contains Low Organic Volatile Compounds(VOC)

• A Polyurea Coating Is Solvent Free And Emits No Toxic Fumes

• Excellent Resistance To Chemicals

• Excellent Resistance To Abrasion

• Provides Corrosion Protection

• Polyurea Coatings Are Fast Set Meaning A Fast Curing Time

• Excellent Adhesion To Metal And Concrete Structures Even When Damp

• A Polyurea Coating Can Be Applied In Temperatures As Low As -30° C

• Proven Track Record

How To Apply A Polyurea Coating

Surface Preparation For The Coating System

Mineral Surface Preparation

All concrete structures must be at least 28 days of age. The substrate must be absorbent in nature. The surface must be healthy with a minimum compression strength of 25N per square millimetre and a minimum bond strength of 1.5N per square millimetre. The surface must be clean and free of diesel, oils and grease. All loose friable materials and foreign bodies must be removed by abrasive blasting, captive blasting or high pressure water blasting. This is to remove all surface laitance.

Monolithic floors and formed surfaces must be abrasive blasted or other preparations means to clean and profile. The surface should be free of any water film. The surface must be free from rising water from the subsoil.  For heavily loaded systems, such as rooftop car parks and petrol stations, where torque may play a role, it is recommended to lightly mineral-surface the primer layer using kiln-dried quartz sand 0.4 to 0.8 mm.

It is imperative to apply conservatively, there should be no dense granular structure. The usage on mineral surfaces will be 200 to 250 gram per square metre. Avoid any uneven thicknesses.

Wooden Surface Preparation

Any wood substrate must be clean and free of diesel, oils and grease. The usage of polyurea on a wood surface will be 100 to 150 grams per square metre. Avoid any uneven thicknesses.

Metal Surface Preparation

The following applies in general. Substrates of all types of metals, must be free of substances which may have a negative effect on adhesion. Such substances include oils and fats. If these types of substances are present any type of metals, they must first be removed with the appropriate agents and/or tools.

Steel, blasted

• Surface blasting, Sa 2½, 75 -100 microns, DIN EN ISO 12 944. Then thoroughly remove all dust. Formation of surface rust must always be avoided.

• Pre-treat the surface with adhesion promotor.

• Apply primer to the surface with a spread of 100 to 150 grams/m2. Avoid any uneven thicknesses.


• Thoroughly sand mechanically until the surface is matt and remove all dust.

• Pre-treat the surface with adhesion promotor.

• Apply primer to the surface with a spread of 100 to 150 grams/m2. Avoid any uneven thicknesses.

Stainless steel

• Surface blasting, Sa 2½, 75 to 100 microns, DIN EN ISO 12 944. Then thoroughly remove all dust.

• Pre-treat the surface with adhesion promotor.

• Apply primer to the surface with a spread of 100 to 150 grams/m2. Avoid any uneven thicknesses.

Applying A Polyurea Coating

The application of polyurea coatings is normally done as a spray coating often referred to as "hot spray". The reason it gets this name is due to the optimal temperature for polyurea coatings being 60-70°C. When polyurea hits the surface of the area it is waterproofing the cure time is just seconds. The reason for this is the reaction of the polyurea coating with the surface is instant.

To get the required heat for the spraying process the two components for a polyurea coating are pumped through heated hoses attached to a spray gun. This means the reaction process occurs inside the hose before the polyurea coating is fired from the gun. Applying the coating as a polyurea spray gives the best attainable physical properties for the protective coating. The hot spray process requires precision, it is a very specific coating system to apply. This means it is very important to use specialist roofing contractors to ensure the best results.

Polyurea Spray Coating Application Step By Step

1. Spray The Perimeter And Detailing First

2. Spray Any Overlaps and Seams In The Existing Roofing System

3. Spray The Rest Of The Roof With A Polyurea Coating

4. Apply A Solar Reflective Top Coat Over The Sprayed Polyurea To Protect The Coating From UV Radiation

The end results is a seamless, maintenance free coating system. This protects the building below from all exterior roof problems. Polyurea coatings have good abrasion resistance, good chemical resistance and provide corrosion protection.

Why Choose RJ Evans As Your Polyurea Coating Contractors

• Vastly experienced asphalt team. We have operatives with more than 40 years’ experience.

• We provide a range of FREE quotations and solutions for all projects.

• Insurance Backed Guarantees.

• Excellent Customer Support throughout project.

• Rated 5 out of 5 from our previous customers.

If you would like RJ Evans to provide a quotation or providing any information relating to polyurea coatings please get in touch with us by our contact form or call us now on 01277 375 511.