G4 Pond Sealer is a moisture-cured polyurethane, which forms a non-porous seal on concrete, brick or porous stone.
G4 uses the moisture in the air and substrate to cure or harden. It can be applied onto slightly damp substrates.
However, it is important that the substrate is sufficiently dry to be porous so as to enable the first coat of G4 to bond and obtain a mechanical grip.
G4 can be applied in poor weather conditions, high humidity and at temperatures down to 0°C. G4 seals out lime.

Available In 
Clear, Black, Green & Blue
500g or 1KG

Durable deep bonding plastic coating for concrete without the need for a primer. May be applied at low temperatures.
Apply the first coat by brush. Avoid applying thick coats. Subsequent coats may be thinned and spray applied.
Ensure cement render is clean, dry and porous – highly trowelled surfaces are not advised. Repair/fill cracks and damaged areas before use.
G4 Standard; 3 coats. G4 coloured needs 2 coats of G4 Standard, then 2 coats of G4 coloured. 
e Recoat in 60-90 minutes between coats. Do not allow more than 4 hours to elapse between coats.
Can be walked on within 60-90 minutes

Deep bonding plastic coating for concrete rendered ponds
Seals concrete floors
Quick and easy to apply
No primer needed
Can be used at low temperatures


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