Weber rend aid is used to improve key prior to the application of render onto a smooth or otherwise unsuitable but sound surface. Can be used on the following substrates:

• Dense concrete
• Brickwork
• Blockwork
• Masonry
• Clean, sound, well-adhered existing render (<19mm)

Ideal as a pre-treatment for render which is required to resist severe exposure conditions. A proprietary mix designed to be used as an adhesive stipple pre-treatment as described in BS EN 13914-1:2016.

Features and benefits

• Equalises suction on mixed backgrounds
• Provides excellent suction control across both high and low suction substrates
• Resists the penetration of external water to improve the weather resistance of rendering systems
• Quality controlled and factory blended to give a consistently high-quality product
• Easy to apply by hawk and trowel before finishing with a stipple roller

Things to consider

• Do not apply to gypsum plaster or previously painted surfaces
• For applications where the codes of practice recommend sulphate resistance, use only the sulphate-resistant cement formulation
• Do not use if frost is forecast within 24 hours of use
• Do not use in damp or wet conditions
• Do not use in temperatures below 5°C or above 30°C
• Not suitable for application onto elevations in direct sunlight or where the substrate is hot
• When stored unopened in a dry place at temperatures above 5°C, shelf life is 12 months from the date of manufacture printed on the side of the bag