How to renovate metal wall claddings located in an aggressive or marine environment?

RD-Elastometal, a very high performance elastomeric coating combining superior anticorrosion and sealing properties

RD-Metal unicoat, the ideal solution to give a new aspect to your cladding while protecting them from corrosion.

Available in a wide choice of colors to match the visual identity of your business.

Restore and protect metal claddings on video

The problem

The coating layer of metal claddings protecting the walls are subject to bad weather and different climates that can be very aggressive at the seaside or in very polluted industrial areas. The rays of the sun, the rain, the wind carrying chlorides, atmospheric pollution coming sometimes directly from the neighboring factory, attack these surfaces on a daily basis.

The coating begins to change appearance after several years and sometimes quite quickly depending on the orientation of the building. The color changes or becomes chalky and whitish, rust appears - first on the edges and around bolts and fasteners; the original coating, may also begin to peel or disappear, leaving the metal side walls bare, exposed and unprotected.

Once the metal is exposed, even if previously galvanized, the work of oxidation and rust begins. Usually, if the metal is galvanized, there will first be whitish traces of zinc salts.

Then, the harsher the environment and the more exposed the surface is, the faster rust will appear and will quickly spread over the entire surface. There are ways to stop these degradations and fix them in the long term.

RD Coatings offers eco-responsible and easy-to-apply solutions that will effectively and durably protect your building!

The solution

Rd-Elastometal & RD-Metal Unicoat

To stop the action of rust and renovate the metal cladding, it is necessary to use a combination of RD-Elastometal as a first coat and RD-Metal Unicoat for the second coat. The first coat of RD-Elastometal will provide excellent corrosion protection. It adheres perfectly to metal or weathered galvanized surfaces (> 1 year old) and thanks to its permanent elasticity, it will follow the expansion and retraction movements resulting from permanent changes in surface temperature.

The second layer, will be with RD-Metal Unicoat, a simple, fast and economic solution giving a neat aesthetical finish to obtain a successful relooking of the building.

Both products have good anticorrosive properties, are UV resistant and weather resistant. They are one-component and water-based and therefore do not present any danger or fire risk. They are also suitable for application inside occupied buildings and will not affect occupants.

They are available in a wide choice of colors from as little as one liter!

Recommended quantity and thickness

RD-Elastometal: 0.4 Kg / m² for 175 µ sec - 130 p² / gallon for 14 mils sec.

RD-Metal Unicoat: 0.20 L / m² for 95 µ sec - 200 p² / gallon for 3.8 mils sec.

The total thickness obtained will be +/- 270 µ / 10.8 mils sec.

Our products being water-based, you avoid

  • bringing hazardous products to the job site and at the same time you eliminate the risk of fire or explosion;
  • nuisance in the vicinity with disturbing odors during and after application;
  • emissions of harmful substances;

You respect nature, the applicator and your immediate environment.

Benefits and expected performance of the system

The system will have a long life if applied correctly and according to our recommendations.

However, the life expectancy of floor cotings is extremely difficult to predict as it depends on many factors; and first and foremost, on the intensity of use of the floor.

On many projects, we receive the feedback that our coatings are extremely efficient with a lifespan often exceeding 5 years. However, the great advantage of the product lies in its ease of use. If there are touch-ups to be done, the use of RD Coatings solutions makes it possible to carry out occasional repairs very easily and in record time!

It offers many advantages, both for the project manager and for the applicator:

For the project manager/owner

  • No blasting required, economical solution
  • High performance and durable system
  • Eco-friendly
  • Water based, safe, no fire hazards
  • Virtually odorless, can be used in occupied buildings without disturbing
  • Wide choice of colors
  • Limited downtime, possible to apply within 24 hours

For the applicator

  • Easy application
  • Almost no VOC
  • No isocyanates
  • High performance
  • Proven track record
  • No pot-life
  • One-component and quick-drying
  • No need for solvents nor thinners.

Getting ready


If the project is outdoor, avoid starting a job if it may rain within 3 hours after application. A minimum of 12°C / 54°F is recommended to have comfortable and safe working conditions. It also allows higher productivity.

Avoid working under direct heavy sunlight, especially in very warm regions where early-morning work or late evening are preferred.

Make sure there is no condensation on the surface before and during the application and the first hours of drying. If you are working indoor, make sure that the area is well ventilated.

Tip: RD-Metal Unicoat has no recoating window. In other words, should the works be interrupted because of a sudden change in the weather, they can be continued later without any problem!

Surface preparation

The most popular and fastest way to achieve a good surface preparation is to high-pressure wash the surface at minimum 180 bar / 2600 psi of pressure with a zero-degree angle oscillating tip. This procedure will remove contaminants, poor adhering paint and -rust from the surface. Remaining paint or rust that resisted may remain as the adherence is still sufficient.

Hand- or power tool cleaning (with abrasive paper or steel brush) is also an option and is advised when more detailed surface preparation must be carried out. 

Make sure that the surface is free of moss, mildew, oils,  greases and chlorides (salts). Rinse using an alkaline solution if not already mixed to the high pressure washer. Think of using biodegradable solutions that can be easily found and are very effective. 

Verify if the existing coating is still adhering properly and there is no loose rust. Never paint on top of a poor adhering coating.

Inspect and threat bolts

Inspect the bolts and screws if any. Defects should be repaired or replaced with new ones. Apply a spot coat of RD-Elastometal by brush after inspection. This will help in the inspection process and provide added waterproofing and anti-corrosion protection in these critical areas.


Check edges, especially when sharp. These are the weakest parts and quickly subject to corrosion if not treated correctly. Apply a spot coat of RD-Elastometal by brush. It will perfectly cover these edges and further protect them.


An additional step which may depend on the location and the extent of the pollution would be to use soap and water to degrease the surface and remove any oils, pollutants and grease. Observe the surroundings to see if any chimneys are emitting fumes as they can cause an accumulation of contaminants on the surface.

Preparing the products

Products are ready for use.

Mechanically stir the products for a few minutes before the application. Do not add any water to any of the products except when clearly specified.

Only if you are working in hot weather conditions, you may dilute the coatings with clean water to delay its drying. But do not add more than 3% of water in order not to diminish its anti-corrosion properties.

RD-Metal Unicoat and RD-Elastometal are best to be applied by brush on specific areas and airless sprayer on the main areas. If spraying is not possible, you can also brush the coating. 


Choose the type of brush according to the size of the objects to be painted.

Specifications for an airless application

RD-Metal Unicoat: output of 180 bars / 2600 psi and a tip size between 0.013 and 0.015 inches.

RD-Elastometal: minimum output of 180 bar or 2600 psi and a nozzle between 0.015 and 0.019 inches.

Both products can also be applied using the Graco Ultra Max portable airless device. It's a simple and effective method for small jobs or for touch-ups on larger scale projects.

Simply rinse the airless device with clean water when changing the product.

At the end of the job, simply clean your equipment with plain water or according to the equipment manufacturer's manual.

We do not recommend applying by roller as it is difficult to achieve the prescribed thicknesses. If you decide to do this, you will need to apply multiple coats to achieve the recommended thicknesses. We recommend using 14mm polyamide rollers or 3/8 inch nap rollers.

The application

The products are ready to use. Stir them mechanically for a few minutes before application.

RD-Elastometal has a fairly high viscosity, which is normal. Do not add water except when clearly specified.

Check before each application that the surface is free of dust, contamination or condensation.

If preparation or application has been interrupted for more than 3 days without rain or if it is located in a polluted environment, we recommend that the areas to be coated be washed again or rinsed with a high pressure cleaner.

The application

If you intend to use a dry film thickness measuring device, measure the thickness of the remaining coating or galvanized steel to later calculate the total applied thickness. If you do not have this device, you can use a wet film gauge during the application that we can provide.

Apply the first coat of RD-Elastometal over the entire surface.

The thickness is important and should be in line with our recommendations. It will be your guarantee for the long term performance of the system.

Allow the paint to dry for 6 hours before recoating. Depending on the weather, it can be shorter or longer.

Apply the second full coat of RD-Metal Unicoat over the entire surface.

Finally, finish details such as metal objects, corners and edges with a paintbrush to make sure they are well covered.

After 4 hours of drying at 20 ° C, the coating is dry and resistant to rain.

The products you need