In decorative concrete, what is the purpose of a release agent and how should it be used?

• A. Release agents prevent bonding of formwork to the surface; apply as directed and clean off residue after form removal to reveal texture.
• B. They strengthen the surface and should be left on the surface after formwork removal.
• C. They color the surface for texture.
• D. They waterproof the surface.

Answer: (A)

Release agents act as a separating barrier between the formwork and the concrete, so the forms can be removed cleanly and the texture or pattern you’re aiming for is preserved on the surface. They should be applied exactly as the product instructs—coat the form surfaces evenly before pouring or stamping, using the recommended method (spray, brush, or roller) and the specified amount. After the concrete cures and the forms are stripped, any residue should be cleaned off to reveal the texture fully and to avoid altering the finish or interfering with sealing. They don’t strengthen the surface, they don’t inherently color the concrete, and they aren’t waterproofing coatings.