Which type of coating is NOT typically used over concrete?

Polyurethane foam is generally not used as a coating over concrete surfaces. While it is a versatile material known for its insulation properties and flexibility, it is primarily used for applications such as spray foam insulation or as a protective layer in specific waterproofing systems.

Concrete surfaces require coatings that enhance adhesion, durability, and resistance to environmental factors. Epoxy coatings are well-known for their excellent adhesion to concrete, chemical resistance, and durability. Chlorinated rubber coatings are also suitable for concrete, offering good resistance to moisture and chemicals. Bituminous cutbacks are often used in roofing applications over concrete and provide a waterproof barrier.

In contrast, polyurethanes, while they can be formulated for various surfaces, are not the most common choice for concrete due to their specific characteristics and application requirements. This makes them less favorable than the other options listed, which are more traditionally recognized for concrete applications.