Bond it Exterior Pregrit is the go-to choice due to its effective bonding agent for render to concrete, brickwork and blockwork, it also works great to improve adhesion to smooth surfaces.
- Thoroughly stir before using.
- Prepare the surface by removing all dust, any flaky bits, release agents and any other contaminants that may be present, this will hinder adhesion.
- Once the background is prepared, sound and you're confident it will support the weight of the render
- Apply 1 coat using a roller or brush, ensuring it's even and you allow it to dry for 6 hours.