Koi

 Keith Holmes

There are three choices: liner, waterproofing paint or fibreglass. If you decide to use a liner to seal your pond you will be presented with a vast array at different prices, thicknesses, and with varying guarantees. As a rule of thumb, you do get what you pay for, and although you may be able to save yourself a considerable amount of money by using a PVC liner over a butyl one, in the long-term you may spend more getting it repaired. Liner is cheap and easy to install, but if your pond is an unusual shape you may find it takes you a little longer. You can buy a product called cold glue tape, which can be used to stick the creases down in awkward corners. If you have a pond with a more uniform shape you may want to consider a box-welded liner, which will cost you a bit more, but will be tailored to fit.

One of the most common pond paints is G4. As with any sealing paint, it is vitally important to ensure that a good smooth render is applied first. It is the actual structure and render that provides both the strength and appearance of the final finish, so it is worth spending a considerable amount of time getting these right. You may want to consider adding a product such as fibre mix to add strength to the render. It is vital that you leave the pond to dry before you apply the sealant. In some cases a drying period of three to four weeks may be required, so a good cover and protection from the elements is essential.

Fibreglass is considered by most to be the best pond liner after paint, but it is also the most expensive. A good rendered structure should be prepared and allowed to dry before any attempt is made at fibreglassing. Unless you’re experienced, it is better to seek the help of a professional fibreglassing company and preferably one that specialises in ponds. Always ask for references and, if possible, try and visit a pond to inspect the quality of their finish first-hand. Finally, do not be swayed by price; although there are bargains to be found, always ask what materials are being used, and actually check what you are getting for your money.