When making your pond out of concrete, you must seal the top layer to prevent water infiltration and lime, which is bad for fish and pumps, from escaping. G4 Sealer is the most efficient tool for accomplishing this. It is just painted directly over the hardened concrete. You can choose between clear (dries translucent) and black. In order to make waterfalls, statues, and other concrete objects safe for your pond, you can also cover them with G4.
For concrete ponds, G4 Pond Sealant is a one-component deep-bonding polyurethane sealant.
Gives all shapes a crisp finish quickly and easily.
Keeping lime out, friendly to fish
Useful in cold temperatures
Useful with anti-crack fibre
Is delivery free?
We offer free delivery on the majority of our products over £50. This excludes live fish and bespoke filters. Delivery to UK mainland addresses is £3.95 as standard, or £6.95 for express.
How do I return a product? Get in touch via email or phone and let us know your problem, we will then help as much as possible. A postage address will be given for you to return the product back to us, and postage will be refunded where applicable to our terms and conditions, which are in line with consumer rights.
At Steel City Koi, we offer a wide range of safe and secure payment options when shopping with us.
Accepted payment methods:
Debit/Credit Cards (Inc American Express)
BACS (for faster dispatch of products) please get in touch for this
Cash upon collection *only for live fish
Pay Later options currently include Klarna and Clearpay