Coating Systems

 

Coating Systems: Polyurethane, Acrylic, Silicone, PMMA, and Spray Foam.

Polyurethane: Polyurethane coatings are considered polymers. They can be very hard and strong, providing exceptional wear resistance. They can also be more soft and ductile, so that the base material is allowed to stretch without destroying the coating. Polyurethane coatings are not flammable, so they can be used for some situations where combustion is occurring in the same environment. Care must be taken to limit the exposure of a polyurethane coating to ultraviolet light because it can cause the coating to degrade.

Polyurethane coatings are notable for their ability to adhere very well to a wide variety of base materials. Many polyurethane coatings require no additional processing to cure. They are simply applied and cure upon exposure to moisture in the air. Some polyurethane coatings also have very fast setting times, and can be applied and set in a broad range of temperatures. They can be sprayed or rolled onto a base material.

Polyurethane coatings are used for many different applications. Wood floors are often coated with polyurethane. Since polyurethane coatings can be waterproof and have high abrasion resistance, they are an excellent choice for this application. Polyurethane coatings are also used on metals and on top of other coatings.

Acrylic: Acrylic surface coatings are used in all three of the paint and coatings market categories—architectural coatings, product finishes for original equipment manufacture (OEM), and special-purpose coatings. Protective coatings other than paints, such as fabric and leather finishes, floor polishes, and paper coatings, can also be based on acrylic polymers; however, these coatings are not included in this report.

Acrylic coatings can be used in organic solventborne, waterborne, powder, or radiation-curable formulations. They are used mainly in architectural, or decorative, finishes, and to coat industrial goods. Acrylic surface coatings are the leading finishes used in the paint and coatings industry, having surpassed alkyd finishes over the past few years. Based on acrylic and/or methacrylic polymers or copolymers, acrylic surface coatings are noted for their inertness and excellent color retention when exposed to outdoor conditions. In 2010–17, consumption rose in most areas of the world. Acrylic coatings now account for about 25% of all coatings on a global basis. For environmental reasons, there has been a shift toward waterborne acrylics used in architectural and automotive coatings. Acrylic latex coatings have captured a good portion of the North American and Western European market for architectural coatings as replacements for solventborne coatings. Use in developing regions as replacements for solventborne coatings and other low-quality, low-durability budget coatings is expected to continue to grow.

Silicone: a silicone roof coating system is a layer of silicone that is applied to a flat roof. It usually dries as a single-ply membrane that protects a roof from moisture, mold, UV radiation, and severe weather. It can be applied to roofs of any size as long as they are flat and in relatively good condition. The roof is one of the most critical parts of any building, but it’s also one of the most difficult and most expensive components to fix. A good roof will last between 25 and 50 years depending on what kind of roof it is, but it can also cost thousands of dollars to replace or repair it when it is too heavily damaged.

It’s easy to assume that there is no way around having to fix a roof, but there is a much cheaper solution that can extend its life and help you avoid costly repairs. It is known as a silicone roof coating system, and when you have it applied correctly, you can make it so you can go for years without having to replace your building’s roof.

PMMA: PMMA is a two part methyl methacrylate based acrylic resin, which cures very rapidly once the catalyst is added shortly before the application. Hence, both the installer and the end customer benefit from the labour time reduced to minimum. Within just an hour from the application, the surface is fully waterproof and shortly after this time foot traffic is allowed.

PMMA liquid applied waterproofing is a cold applied, flame free system consisting of one coat of primer (if required), PMMA resin coating and a reinforcement made of polyester fleece fabric.
Polymethyl methacrylate resins were first synthesized in 1930’s and they quickly made their way to practical applications as the material proved to be exceptionally durable.

Firstly too rigid to be applied as flexible coating, it took some time before it was used in roof waterproofing. It was in 1970’s that a special PMMA formulation was developed to meet the performance standards of flexible and resilient waterproofing coating.

Now PMMA advantages are particularly appreciated by roofers and installers on jobs with difficult access, roofs with multiple penetrations, when flame-free application is required and short curing time is essential.

PMMA liquid roofing solutions are also a perfect choice for areas requiring resistance to certain substances that may negatively affect traditional roofing products: vegetable oils, environmental contaminations, foot traffic, UV impact.

Spray Foam: Spray Polyurethane Foam (SPF) roofing provides excellent insulation and custom slope to avoid ponded water issues and improve water flow to drainage. SPF roofing systems require a roof coating to be applied over the foam in order to cover and protect the spray polyurethane foam from deteriorating due to the sun’s harmful UV rays. Spray foam coatings all contain low levels of VOC’s, provide energy cost savings and create minimal disruption to the tenants and occupants inside the building during construction. These coatings have been successfully used on spray foam roofing systems for over 30 years, providing renewable and sustainable systems that are seamless and have outstanding waterproofing capabilities.