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Free shipping Over £50
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30 days return
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Secure checkout
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Over 1000 Happy Customers
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Express Delivery Available

According to EEC Directive 98/83/CE, Impermax is a single-component, high-performance waterproofing compound that is based on polyurethane and can come into direct contact with drinking water intended for human consumption. It may be applied with ease to a variety of surfaces utilised in hydraulic infrastructures, including reinforced polyester, fibreglass, concrete, mortar, and ceramics. Time required for curing: 4-6 hours in the summer, 12‚24 hours (in the winter). Incompatible with PP or PE. To achieve a membrane thickness of 1.5 to 1.9mm (2 kg per m2), apply at least 3‚Äö√Ñ√¨4 layers. In the majority of circumstances, humidity primer is advised.
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
Safe and Secure Checkout