Where to use
Use elastomeric coatings on exterior elements, such as roofs, concrete walls and floors, masonry, stucco, (originally formulated for stucco) or wood.
Cautions
Be careful when using it on wood siding or logs, which need to breathe. Any breach in the coating, however small, can lead to moisture getting to the wood, leading to decay, mold growth and further damage. If applying over wood, do not seal the wood completely. Allow a way for wood to dry. If the coating is confined to the exterior surface, wood can still dry toward the inside, providing there isn’t an inside vapor barrier. The key is to prevent trapping moisture in the wood.
Preparation
Elastomeric coatings penetrate very little, so surfaces should be prepared carefully. Fill cracks, dents, holes and voids with an appropriate filler. Be sure concrete, masonry and stucco are thoroughly cured and dry before applying.
Application
More than one coat may be necessary, even when advertising claims one-coat coverage. If the finished coating looks like latex paint, it may be too thin. If applied with a sprayer, you should back roll coats before re-coating.
Advantages
Some hybrid coatings combine the properties of an elastomeric with acrylic paint. Longer lifespan means fewer applications. Manufacturers often offer longer warranties.
Disadvantages
Higher cost may lead to the temptation to skimp. Holes or breaks in the coating may lead to moisture penetration that can cause long-term damage. Some coatings require primer or a base coat. Thickness may give a rubberized or plastic appearance
