Hydroc Render

Application Instructions

Surface Preparation

Remove any weak, spalling, unconsolidated concrete and any existing coating and thoroughly clean surface. If steel reinforcement is exposed remove any rusting on the steel surface. If patching is required, please patch with Hydroc Cempatch or Hydroc Micro Concrete (Hydroc Render is a coating only).

Concrete must have the open capillaries and a rough surface. If surface is too smooth or covered with oily matter the concrete is to be lightly sandblasted, acid etched, or water pressured. Then hose the concrete surface to fully impregnate with water and allow drying to a wet dull lustre and puddle free.

Application Method

Priming

We recommend priming as a part of the installation process described below. Aardcure Catalyst (as a primer) is applied on the concrete substrate in order to passivate the steel reinforcement embedded beneath the concrete and completely harden the concrete surface, creating an appropriate adhesion platform; and as a result, the increased bond strength of Hydroc Render coating.

Apply Aardcure Catalyst at the rate of one litre per 3-5 square metres on the dry touch concrete substrate to fully impregnate with Aardcure Catalyst (instead of the water impregnation in the process of surface preparation) and allow drying to a wet dull lustre and puddle free.

Mixing

• Use a low sheer mechanical mixer to ensure proper mixing.
• Normal water requirement is 3.3-3.7 L per 20 kg pail dependant on required viscosity.
• Place 3 litres of water in a clean mixer bucket. While stirring gradually add Hydroc Render, and mix thoroughly for 2-3 minutes.
• If necessary, add additional water, until a mix of the desired workability is obtained. Mix for a further minimum 1 minute. Use within 30 minutes.

Application

Apply by bagging techniques, trowel or spray to a wet, puddle free surface, at a thickness of between 1.5 and 5 mm.

Note: If a shorter cure time is required for hydraulic concrete, Hydroc Render can be applied to a dry surface by vigorous bagging and smoothing by trowel if necessary.