Preparation
Thorough substrate preparation is essential.
Concrete repairs should be prepared with squared off edges having a 4mm minimum vertical lip. Remove all loose material – wire brushing is advisable. Sweep clean or vacuum. The surface must be free from grease, oil or contamination. Ensure concrete is dry.
Caution – Cretex MC is methyl methacrylate based and has a characteristic odour during the vaporising of the solvent. Although non-toxic and non-injurious to health, this can cause tainting and OPEN food products should therefore be removed or sealed during and following application until the vapour has dispersed.
Priming
The substrate should first be primed with Polycote MC Primer CSG, brushing thoroughly into the entire surface. Allow the primer to cure, normally within 45 minutes.
Mixing
Using a clean plastic bucket of at least 15L capacity, mix the resin with the hardener powder. Then add the powder pack and fully mix for 3 minutes using a heavy-duty slow speed drill with a 0-15 litre mixing paddle until a homogenous mix is achieved.
Ensure thorough mixing as an unmixed product will result in a poor or non-cure situation.
Tip: For Cold Store Grade – the workable life of the material will be maximised if it has been conditioned (e.g. store in the cold store itself) prior to mixing.
Application
The material should be placed immediately after mixing.
Tamp the product to ensure a good compaction and trowel out to smooth finish. Do not featheredge.
Where the depth of repair requires more than one layer (see ‘Application Thickness’). MC Primer should be applied between layers to aid inter-section bonding – see ‘Priming’.
For vertical repairs – where step nosings or expansion joint edges have broken away, the vertical face of the repair material should be supported to prevent slumping.
Suitable sized wooden shuttering should be covered with polythene to reduce adhesion, and should be removed as soon as the material is firm.
Cretex MC may also be used for screeding and cove-forming – please contact Polycote Technical Helpline.
Application Thickness
The recommended range of application thickness of Cretex MC is from 4-15mm per layer.
For repair depths exceeding 15mm, the product should be built up in layers not exceeding 15mm each. The product should be allowed to cure between each layer.
Application Temperature
Cold Store Grade: -20°C to 0°C
