Elastomeric coatings are applied as wall coatings to protect interior and exterior walls. Elastomeric paints can be water-based paints and paints or acrylic latex paints. They are applied as thick coats on concrete structures.
Elastomeric or acrylic paints fall into the latex paint category because they have a milky white color when wet; when dry, they become pliable, stretchable, and transparent. Elastomeric coatings may also be referred to as latex coatings or acrylic latex.
Elastomeric coatings are better suited for painted structures that require a type of paint that forms a moisture barrier. Although elastomeric paint is relatively new compared to many others, as it developed in the late 1950s it became one of the main paints used on many different types of structures.
Elastomeric coatings are commonly used on exterior elements such as concrete walls, roofs and floors. However, they should not be used on wood siding or logs that need to breathe, as any breaks in the coating will allow moisture to enter the wood, which can lead to rot, mold growth and other damage. The wood should be allowed to dry properly and should not be sealed until dry.
A common application of elastomeric coatings is to prevent corrosion on rebar (called "rebar") by covering gaps, cracks and small openings through which outside air can enter. Elastomeric coatings can also improve the appearance of the structure.
The elastic coating has the following functions:
As the coating dries, it plugs the open pores of the concrete.
Resistant to solvents and microorganisms.
Resists chalking, cracking, blistering, flaking and peeling.
insist strongly.
Stays color for a long time.
Dries quickly with minimal odor.
Dries smooth when applied on the surface.
The three types of elastomeric coatings that are more widely used are acrylic, silicone, and polyurethane.
Acrylic Elastomeric Paint
Acrylic elastic paints are water-based and are usually only suitable for sloped roofs. If an acrylic roof has water flow issues, it means the water just sits and doesn't run off the roof - this can cause the coating to thin, turn back into fluid and eventually wash off the roof.
By volume, acrylic elastomeric paints are approximately 52% solids and 48% water, which is why sometimes almost half of the product is lost through evaporation when applied. However, they are less expensive than many other elastomeric coatings - partly because you need to apply more product to account for what is lost during evaporation.
Silicone Elastomeric Coatings
Silicone Elastomeric Paint is a silicone resin based paint that is 96% solids and 4% carrier, which means it won't wash away like acrylic paint.
Elastomeric coatings of this type perform well on flat roofs because they can withstand sitting water. They are mid-range in terms of performance and price, and they are twice as durable as acrylics. However, they are more expensive than acrylic elastic paints.
polyurethane elastic coating
Polyurethane elastomeric coatings are more impact resistant than any other elastomeric coating, although they are very expensive compared to silicone and acrylic coatings.
achieve the required performance
Ensuring adequate film thickness is important to ensure that elastomeric roof coatings perform as intended. This is to prevent ultraviolet (UV) degradation, as coatings without sufficient film thickness may not adequately block UV rays and bridging. When this happens, the color under the coat will start to show through; this can make the white coat appear gray if the coat has been applied to a dark surface.
As a general benchmark, elastomeric roof coatings can meet the physical properties specified in a Technical Data Sheet (TDS) with a minimum of 20 dry film thickness (DFT).
