Best anti rust paint UK: colour coat or converter
Updated: 22 October 2026
You have a rusty steel gate, a short run of railings, or a chip on a ferrous fitting, and the amazon.co.uk results all say anti-rust paint. Some of those tins are a gloss colour. Others are a liquid that turns rust dark and still needs a topcoat. By the end you should know which of those two jobs you are buying, and whether 250 ml or 750 ml is the tin that can cover it. The [anti-rust paint comparison](/hub/paints-and-varnishes/anti-rust-paint) holds the prices for the eight listings. Prices, stars and review counts are the saved amazon.co.uk figures, compiled on 20 October 2026 by Peter F. This was not a lab test. A qualifying purchase can earn us a commission at no extra cost to you.
You have a rusty steel gate, a short run of railings, or a chip on a ferrous fitting, and the amazon.co.uk results all say anti-rust paint. Some of those tins are a gloss colour.
You have a rusty steel gate, a short run of railings, or a chip on a ferrous fitting, and the amazon.co.uk results all say anti-rust paint. Some of those tins are a gloss colour. Others are a liquid that turns rust dark and still needs a topcoat. By the end you should know which of those two jobs you are buying, and whether 250 ml or 750 ml is the tin that can cover it. The anti-rust paint comparison holds the prices for the eight listings. Prices, stars and review counts are the saved amazon.co.uk figures, compiled on 20 October 2026 by Peter F. This was not a lab test. A qualifying purchase can earn us a commission at no extra cost to you.
Our top picks
| Badge | Product | Role | Pack | Finish | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  Hammerite Hammerite smooth black 750 ml | Direct-to-rust metal paint | 750 ml (size field also says 1 L) | Gloss | 9.4 | about £20.43 | View offer |
| Alternative |  Hammerite Hammerite hammered black 250 ml | Direct-to-rust metal paint | 250 ml | Textured hammered | 9.4 | about £10.49 | View offer |
| Best value |  Hammerite Hammerite Kurust 90 ml | Rust converter | 90 ml | Matte treatment, not a colour coat | 9.2 | about £7.20 | View offer |
On this page
Colour coat or converter
Best anti rust paint UK is not one product. A Hammerite Direct to Rust colour coat is the finish you see: smooth gloss or a hammered texture, sold as a primer, undercoat and topcoat on the black 750 ml listings. A rust converter in this set, Kurust, Rustins or Vividye, is a treatment. It is meant to react with rust and then sit under a colour. If you need the gate black and glossy this weekend, the colour coat is the simpler buy. If the rust is a stone chip or a pit you will paint over, the converter is the smaller purchase.
The words on the tin do not do the wire-brushing. Hammerite’s UK pages still say loose rust, flaking paint and grease come off before direct to rust means anything. A converter that never goes dark has not finished its job either. Buying the wrong family wastes the tin even when the price looks right. A remover, which dissolves rust, is a third product and is not in this set. The rust converter versus rust paint page stays with that chemistry.
What the metal allows
These Direct to Rust tins are specified for rusted or bare ferrous metal: iron and steel that can rust. Bare zinc, aluminium and galvanised steel are the wrong first coat. Hammerite sends that metal to its own special primer or galvanised paint. A retailer line that says the same smooth black suits ferrous and non-ferrous metal fights the maker’s warning. Do not follow the wider claim. A galvanised garden gate that has never been painted is a different job from a steel gate whose old paint is failing.
Sound old paint on ferrous metal can take a test patch, left for about an hour, and sometimes one coat if the patch holds. Bare or rusty ferrous metal wants two coats of Direct to Rust. Flakes still come off first. Severe scale is not a brush-over. Vividye’s bullets say sandblast loose scale on heavy rust, and Hammerite’s gate guide allows a rust treatment before the colour when the bars are badly pitted.
How much tin you need
Hammerite’s UK smooth and hammered pages both use about 5 m² per litre. A Toolstation sheet for smooth black manufacturer ID 5092966 turns that into about 3.75 m² from a 750 ml tin, with two coats and a recoat after 4 hours. That 3.75 m² is a trade figure from the maker’s rate, not a survey of your gate. It is still the number to buy against. The amazon.co.uk field of about 10–12 m² per litre on one 750 ml black tin, and 12 m² per litre on the other, will make you order too little if you trust it.
A 250 ml tin is a repair or a small frame. At the same 5 m² per litre it is about 1.25 m² for the system: a short railing, a bench, or a touch-up, not two coats on a pair of gates. The gates and railings page stays with edges and both faces.
Which listing matches the job
Entry prices in this set run from about £7 to £11. Hammerite Kurust 90 ml is the spot you will overcoat. Rustins 250 ml is the step up when the pits need more than 90 ml of ferrous converter. The 250 ml colour coats are smooth white at £9.99, smooth silver at £10.25, and hammered black at £10.49. White and silver both show 4.6 from 20,430 reviews. Treat that as one parent pool, not as 20,430 people reviewing each tin.
The mid band is the two smooth black 750 ml tins. The top pick is the £20.43 listing, 4.7 from 7,075 reviews. Its title says 750 ml and the size field also says 1 L, so open it before you assume a litre. The £22 listing is the same colour job, 4.7 from 1,454 reviews. There is no performance gap here that justifies calling the dearer tin better. Vividye at £29.99 is 2 litres and 4.2 from 50 reviews: volume of a matte black base, not a 7,000-review enamel. None of these listings is a pond, a gutter in permanent water, or a food-contact coating. A waterproof tick is not a reason to immerse the metal.
Common questions
Do I buy a colour coat or a rust converter?
Buy a Hammerite colour coat when the tin itself is the finish on rusty or bare steel. Buy Kurust, Rustins or Vividye when you need to stabilise rust before a colour. Kurust at £7.20 is the small spot. The smooth black 750 ml top pick at £20.43 is the gloss gate. A converter left bare is not the same purchase as an enamel, and neither product lets you paint over loose flakes.
Is 250 ml enough for railings?
It can be, for a short run or a touch-up after you have brushed off loose rust. Hammerite’s about 5 m² per litre makes 250 ml roughly a quarter of a litre of coverage, which reviewers in this set use on front railings, a garden gate or a bench. Two coats on a pair of gates, including the back and the edges, is the 750 ml job. The white listing’s 3 m² per 250 ml is a higher figure than the maker’s rate.
Why do some listings say 10–12 m² per litre?
The smooth black 750 ml ASIN B004R23DE2 prints about 10–12 m² per litre, and B0082LTMD0 prints 12 m² per litre. Hammerite’s UK smooth page, and a Toolstation sheet for model 5092966, use about 5 m² per litre, which is about 3.75 m² from 750 ml. Buy against the maker’s figure. The higher listing number is the one that leaves you short of a second coat.
Does rusty steel need a separate primer?
On the black 750 ml listings, Hammerite calls the enamel a primer, undercoat and topcoat, and the silver bullets say no primer. You still remove loose rust and grease, and bare or rusty metal still wants two coats. A UK review of bare railings on the top-pick tin used a thin coat plus two more. Galvanised steel is the exception: that surface wants the maker’s special primer, not this first coat.
Can I use the same tin on a galvanised gate?
Not as the first coat on bare galvanising. Hammerite’s Direct to Rust pages keep bare zinc, aluminium and galvanised metal on a different primer or a galvanised paint. A shop page that adds non-ferrous metal to smooth black is wider than the maker. If the galvanising is already failing back to steel, you are painting steel, and the flakes still have to come off.
Is Kurust the paint, or something I paint over?
Kurust is the treatment. Reviewers describe a dark or blue-black reaction, then a topcoat after about 3 hours. The 90 ml blister is what buyers call smaller than they expected, which fits a chip, a tow bar or a pit, not a gate in gloss black. At £7.20 and 4.6 from 4,655 reviews it is the best value for that spot. It is not the colour coat.
Related pages
Sources
Public sources from the research digest, last checked on 22 October 2026. Shelf prices and star lines are the amazon.co.uk figures in the display file. The price band is this set, not a market average. No listing was lab-tested.
- Hammerite Direct to Rust (retrieved 22 October 2026)
- Hammerite Direct to Rust metal paint, smooth finish (retrieved 22 October 2026)
- Hammerite Direct to Rust metal paint, hammered finish (retrieved 22 October 2026)
- Hammerite Kurust (retrieved 22 October 2026)
- VOC in Paints, Varnishes and Vehicle Refinishing Products Regulations 2012 (retrieved 22 October 2026)
- HSE OCE2: solvent brush painting controls (retrieved 22 October 2026)
- GOV.UK: hazardous waste disposal (retrieved 22 October 2026)
- Rustins rust converter data sheet (retrieved 22 October 2026)