Sandblasting Old Iron Gates and Railings in Dorset
Old iron gates and railings take a beating. Years of rain, salt air and flaking paint leave them rusty and tired, and a fresh coat of paint on top just hides the problem for a season or two. To make them look good and stay good, the old paint and rust have to come off first.
I've been restoring gates and railings in Dorset for over 30 years, from historic gates at Hatch House to Victorian cast iron on ordinary family homes. This guide explains how blasting works on ironwork and what to expect.
Why painting over rust doesn't work
Rust keeps spreading under paint. Even a small patch left behind will lift the new coat within months, and you're back where you started. Wire brushing and sanding by hand get the loose bits, but they can't reach into the scrolls, joints and decorative detail that old ironwork is full of.
Blasting reaches all of it. The media gets into every curl and corner and leaves the metal clean, bare and even, which is the best surface you can give a primer.
What blasting does for ironwork
- Removes rust and old paint from every surface, including the tight spots.
- Shows up problems early. Once the metal is bare you can see cracks, weak joints and thin patches that were hidden before.
- Gives paint something to grip. A clean, lightly keyed surface helps primer and paint stay put for years.
- Keeps the detail. Cast iron has fine detail, and the right media cleans it without rounding it off.
Cast iron, wrought iron and steel
Not all ironwork is the same, and each type has its own quirks.
- Cast iron is hard but brittle. It takes blasting well, but needs care around thin decorative sections.
- Wrought iron is softer and more fibrous. It needs a lighter hand so the surface isn't pitted.
- Mild steel is the most forgiving. It's often used on newer gates and handles heavier cleaning.
Matching the media and pressure to the metal is what separates a good job from a rough one. I explain more about how that works in what's the difference between blast cleaning and sandblasting.
Why speed matters after blasting
Bare iron starts to rust again surprisingly fast, sometimes within hours in damp or salty air. That's why the next step shouldn't wait. A primer goes on as soon as possible, followed by paint or another protective coat.
Some customers have their gates blasted, primed and painted in one go, and that's the easiest way to protect the finish. For more on why preparation matters so much, read how to prepare metal or stone for painting.
Taking the gates off or leaving them in place
Whether your gates can be removed for blasting depends on the job. Small gates are often easiest to take down and bring in, while large railings fixed in stone may need a different approach. I offer mobile blasting with proper dust control for jobs that can't be moved, so tell me what you've got and I'll say what suits.
Looking after ironwork once it's done
- Keep it painted. Check once a year and touch up chips before rust gets in.
- Clear drainage points. Standing water at the base of posts is where rust starts.
- Watch the joints. These are the first places paint cracks.
Frequently asked questions
Can you blast gates that are still fitted?
Sometimes. It depends on how they're fixed and what's around them. Send me a photo and I'll tell you what's possible.
Will blasting damage decorative ironwork?
Not when the media is chosen to suit the metal. Cast iron and wrought iron need different handling, and fine detail needs a gentle touch.
How soon should I paint after blasting?
As soon as you can. Bare iron can start to rust within hours, so primer should go on straight away.
Related reading
- How much sandblasting costs in Dorset
- Removing paint from brick without damaging it
- Sandblasting wood beams and doors
- How to choose a sandblasting company in Dorset
- Shot blasting and sandblasting media explained
If you've got gates or railings that need attention, call me on 01202 526649 or use the contact page. You can also see more of what I do on the services page.