Cast iron is a strong, durable and highly versatile material. If the metal is exposed to oxygen, however – which it will be during use – then it’s prone to rusting. That’s why it’s essential that your cast iron rainwater pipes are coated, to create a buffer layer between the elements and the base metal. For this purpose, we use a primer, an iron oxide paint, and then a final finishing coat of paint. In this blog, we’ll show you exactly which kinds of primer and paint you should be using to keep your pipes pristine and protected.

Step 1: Two Coats of Zinc-Based Primer

As a metal, zinc is far less prone to rusting and corrosion than iron – around one hundred times slower, in fact. Two layers of a zinc-based primer, therefore, will give your cast iron an even greater amount of protection against the elements. Zinc-based primers are relatively inexpensive and can be purchased at hardware and DIY stores.

Step 2: One Coat of Micaceous Iron Oxide

A layer of micaceous iron oxide helps further prevent corrosion from occurring, and also helps prevent other undesirable issues such as cracking, blistering and peeling. You can purchase micaceous iron oxide from most major commercial hardware stores and wholesalers.

Step 3: Two Coats of Gloss Paint (Typically Black)

The final layer to add is the paint that’s applied, not only for aesthetic purposes, but again to provide an additional layer against corrosion. The glossy nature of the paint helps give your pipes that high-quality looking sheen you’re after. Although traditionally cast iron rainwater pipes have been finished with glossy black, that’s not to say you can’t also look at other options if you’re looking to rock the boat a little. That said, why tamper with a good thing?

When to Retouch Your Pipes

If you ever notice any scratches, scuffs or any other small damaged areas on your cast iron rainwater pipes, then you should reapply some paint so as to protect the exposed area from rusting or other weathering-based damage. For more general maintenance, you should look to apply a fresh coat of paint every one or two years. A periodic maintenance regime for your cast iron rainwater goods will keep them working optimally.

What Paint Shouldn’t You Use?

Just as there are certain paints you should look to use when you’re painting your cast iron pipes, there are also paint types you should absolutely steer clear of. As a rule, for instance, you should never use water-based paints on your cast iron rainwater goods. Nor should you use acrylic or latex paint.

Final Thoughts…

Keeping your pipes in good condition with routine fresh coats of paint will ensure they both continue to work effectively for a long time, as well as looking great. For more information on our cast iron rainwater products, then get in touch. Contact Metal & Glass today on 01752 917497 or by filling out one of our online enquiry forms. However you wish to get in touch, we look forward to hearing from you.