G4 Clear Pond Sealer

G4 Pond Sealer is a durable moisture-cured polyurethane that creates a strong, non-porous seal on concrete, brick, and porous stone surfaces. It cures using moisture from the air and substrate, allowing application even on slightly damp surfaces and in challenging weather conditions down to 0°C. Its excellent adhesion ensures a reliable mechanical grip, while effectively sealing out lime to protect your pond structure. Ideal for lasting waterproofing, G4 Pond Sealer offers peace of mind and long-term performance for your aquatic projects.

• 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

G4 Pond Sealer Method of Application

Apply the first coat of G4 pond sealer by brush, a roller can be used but it is necessary to avoid puddling of the G4 pond sealer on the base, it is best to use a brush, allow the first coat of G4 pond sealer to become finger tacky ( like cellotape ) or dry enough to walk upon carefully, approximately 45-60 minutes depending on humidity, then apply 2nd coat of G4 pond sealer, when second coat of G4 pond sealer is finger tacky apply third coat of G4 pond sealer, no longer than 4 hours should pass between coats, if a colour is used, then use 2 coats of standard and 2 coats of colour, G4 pond sealer is mechanically hard after 24 hours but must be given 72 hours to chemically cure, after which the pond can be washed down with plenty of water, drained, and can then be filled.

We strongly reccomend that you mix Black Knight Wizard Fibre or some similar fibre into the render mix. This will help prevent the frost cracking the render in winter and give additional strength to the structure.

G4 Pond Sealer Clear Aplication

Apply first coat of G4 pond sealer Clear by brush, a roller can be used but it is necessary to avoid puddling of the G4 pond sealer Clear on the base. Allow first coat to become finger tacky or dry enough to walk carefully upon, approximately 45-60 minutes depending on humidity, then apply the second coat of G4 pond sealer Clear. When second coat is finger tacky apply Third coat. No longer than 4 hours should elapse between coats. Normally 3 coats of G4 pond sealer Clear is sufficient to build a continuous surface film but on very porous substrates a 4th coat of G4 pond sealer Clear may be required, apply as instructed above. 

G4 Pond Sealer Colour Aplication 

The system is slightly different. When using G4 Pond Sealer Colour the first two coats must be G4 Pond Sealer Clear. This is because G4 Pond Sealer Clear provides the maximum non-porous seal and adhesion.

Follow the application instructions as detailed for G4 Pond Sealer Clear but the last two coats will be G4 Pond Sealer Colour. G4 Pond Sealer is mechanically hard after 24 hours and workable on some 6 hours after final application. However, 72 hours must elapse for full chemical cure, before washing down the G4 Pond Sealer with copious amounts of clean water. This water should be drained off. The koi Pond can then be filled. Consumption of G4 Pond Sealer will vary slightly according to the porosity of the substrate.

G4 pond sealer Clear - 3 coats = 550g per sqm for the three coats (approximatly 185ml per squ. metre)
G4 pond sealer Coloured - 2 coats of Clear = 410g per sqm for 2 coats (approximatly 205ml per squ. metre)