Hammerite Kurust Review

by Sam Wood | Last Updated: 10/09/2021

Do you have some really rusty metal that you want to paint but you think it may be a little too rusty, even for something like Hammerite? Well, that is where products like Kurust come in.

Hammerite Kurust is a brush on rust treatment that converts iron oxide (rust) to stable iron complexes. This can then be painted over, thus eliminating the rust. Or that’s how the theory goes anyway, there is only one real way to find out how well it works. So I hopped onto Amazon and bought a tub of the stuff, luckily I have tons of rusty metal lying around at the workshop so finding a test subject won’t be hard at all.

Works Well!
Hammerite Kurust, 250 ml
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09/23/2021 04:35 pm GMT
Hammerite Kurust

Hammerite Kurust

here’s my bottle of Kurust waiting to be used. The instructions from Hammerite state the following:

  1. Clean surface by removing all loose paint and rust, dirt, grease and salt.
  2. Rinse with clean water and allow time to dry.
  3. Shake the container well and pour the required amount into a plastic container.
  4. By brush: apply directly to the rusty area, working well into heavily pitted areas, corners and edges.
  5. Avoid coating onto painted areas.
  6. Hammerite Kurust will turn blue/black when reacting with rust.

Inside the bottle

Let’s open the bottle up and see what this stuff looks like, I have never used it before so have no idea what’s inside.

Inside The Kurust Bottle

Inside The Kurust Bottle

So that’s what Kurust looks like, almost a milky substance, I don’t know what I was expecting to be honest but here it is.

The Metal

here is the rusty metal that I will be painting today. I have wire brushed it and cleaned it as instructed by Hammerite themseleves.

As you can see this is a really rusty piece of metal, so should be a really good test subject.

The Metal Wire Brushed

The Metal Wire Brushed

Using Kurust

The first thing you need to do is pour some Kurust into a separate tub. You don’t want to put your brush in and out of the tub as any rust particles on your brush could end up ruining the entire tub.

So with that in mind, separate off a small amount, you don’t need much. I just used a paint kettle for this.

Ready to paint on

Ready to paint on

Painting the Kurust on

This stuff is really watery so be careful not to splash it everywhere when painting it on.

Starting to paint the kurust on

Starting to paint the kurust on

Now it starts reacting

You can see that the once rusty surface is starting to turn black. This is good and it means that the Kurust is working and it is starting to transform the rust.

Going Black, That Means It's Working

Going Black, That Means It’s Working

After a little While

Now that the Kurust has had time to work its magic the rust has transformed. It is now dark black and looks like a completely different surface.

Now Completely Black

Now Completely Black

Painting over the Kurust

So now the Kurust has had time to work its magic it is time to paint over it. I just used some Hammerite smooth black paint for this.

Painted Over With Hammerite Smooth Spray

Painted Over With Hammerite Smooth Spray

The paint went on just fine. It has adhered well to the new Kurust surface, it does not chip or knock-off so a big thumbs up there.


The Kurust has definitely transformed the rust and turned it into a really solid surface for painting on.

I have now moved this sample outside so I can see if the rust comes back, or if the Kurust has killed it off for good. So make sure you check back soon for an update.

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Wood by name, wood by nature. I am a fully qualified, time-served, award-winning joiner with an NVQ Level 3 in Carpentry and Joinery as well as an HNC in Construction. Beyond my joinery qualifications, I have also earned a degree in building surveying. I believe these qualifications make me perfectly positioned to provide expert advice on many different areas of DIY as well as share all of the tips I have picked up in over a decade working on building sites!