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Zinc spray vs galvanising

Updated: 16 October 2026

You have a bare steel bracket, or a galvanised gate with a bright scar, and a hardware-store aerosol looks able to stand in for a dip. Zinc spray vs galvanising is that choice. One process is a molten bath. The other is paint you spray on site. The [zinc spray comparison](/hub/occupational-safety-accessories/zinc-spray) is where the cans and prices sit. This page is from the Products Compared editorial team, following the galvanisers' associations and Wedge Group, read on 15 October 2026. No laboratory test. A qualifying purchase through our links can earn a commission at no extra cost to you.

You have a bare steel bracket, or a galvanised gate with a bright scar, and a hardware-store aerosol looks able to stand in for a dip. Zinc spray vs galvanising is that choice. One process is a molten bath.

Our top picks

Motip Motip M04059 alu-zinc spray, pack of 2

Best overall

Motip Motip M04059 alu-zinc spray, pack of 2
9.4/10about £32.68
View offer
Hycote Hycote XUK207 zinc primer, pack of 2

Best value

Hycote Hycote XUK207 zinc primer, pack of 2
9.0/10about £19.12
View offer
Motip Motip M04061 zinc spray 400 ml

Rank 3

Motip Motip M04061 zinc spray 400 ml
8.6/10about £8.96
View offer
On this page
  1. 1.Two different processes
  2. 2.What hot-dip gives you
  3. 3.When the can is enough
  4. 4.Thermal spray is not the can

Two different processes

Hot-dip galvanising immerses fabricated steel in molten zinc. SteelConstruction.info describes that bath at about 450°C, with a metallurgical bond between the zinc-iron layers and the steel. The coating reaches surfaces the zinc can wet, including internal corners a spray misses. Bath size limits the work. A long farm gate may fit a UK galvaniser's kettle, and a longer fabrication may not. The can stays outside that bath. It leaves a paint film where you point it, on a surface you have cleaned, at ambient temperature. The European General Galvanizers Association states that only batch hot-dip to EN ISO 1461 gives the full dipped coating, and that zinc-rich paints are not equivalent. One shared name is how a search mixes a small aerosol with a plant specification.

What hot-dip gives you

BS EN ISO 1461 is the specification for hot dip galvanized coatings on fabricated iron and steel articles. The old BS 729 is superseded. The BSI record describes a dip, and it does not cover a later coating on an article that is already galvanised. Repair paint is a separate job. It is not a route for a hardware-store can to meet the dipped specification. On the Association's table, steel thicker than 6 millimetres has a mean minimum of 85 micrometres. That figure is the dip, not the repair. The repair page sets a separate target of about 100 micrometres of zinc-rich paint, unless something else is agreed. A chip on an 8 millimetre farm-gate rail is not a new 85 micrometre dip.
Motip Motip M04059 alu-zinc spray, pack of 2

Testsieger

Motip Motip M04059 alu-zinc spray, pack of 2
9.4/10about £32.68
View offer

When the can is enough

Use the aerosol when the damage is a small chip, a cut end, or a weld burn, and the rest of the galvanising is still sound. That is the site method the Galvanizers Association describes: wire-brush, then zinc-rich paint by brush or aerosol. Use the dip when the article is new work, or when the damage is past about 10 square centimetres or about 0.5 percent of the surface. Wedge Group's 2022 guide says regalvanise past those limits unless a repair is agreed. If you can cover the bright metal with a postage stamp, a zinc-rich aerosol is the spend. A bare bracket that has never been dipped goes to a galvaniser. A chip on steel that is already galvanised, including the 100 micrometre target, is on zinc spray for galvanised steel.

Thermal spray is not the can

Thermal zinc spray is molten metal applied with a spray gun, typically after blasting, under BS EN ISO 2063. It is workshop plant, a third process beside the hot-dip bath and the hardware-store aerosol. If a fabricator's quote says zinc spray, ask which of the three is being priced. The aerosol remains paint for a small area of clean metal. It does not give you the dipped thickness, the metallurgical bond, or cover inside hollow sections. Once a can is the right tool, the zinc spray buying guide is the checklist.

Common questions

Is zinc spray the same as galvanising?
Zinc spray and hot-dip galvanising are different processes. Hot-dip immerses fabricated steel in molten zinc and builds a metallurgical coating to BS EN ISO 1461. A hardware-store zinc spray leaves a paint film. The European General Galvanizers Association states that zinc-rich paint is not equivalent to batch galvanising. They meet on a small repair to steel that was dipped already.
When is the aerosol the right spend?
The aerosol is the right spend for a small chip, a cut end, or a weld burn, when the surrounding galvanising is still sound. A bright patch you can cover with a postage stamp is the scale. A bare bracket that has never been dipped, or a long run of rust, is outside that spend. Can prices do not change the limit.
When should the article go back to a galvaniser?
Send it when it is new work that should be galvanised, when the specification was a dip, or when the bare area is past about 10 square centimetres or about 0.5 percent of the surface. Wedge Group's 2022 guide says regalvanise past those limits unless a repair is agreed. A rail that is bright along half its length should go to the plant.
Does BS EN ISO 1461 apply to the can?
BS EN ISO 1461 specifies the hot-dip coating on fabricated iron and steel. The BSI record describes a dip, and it does not cover a later coating on steel that is already galvanised. You specify EN ISO 1461 when you want the bath. A repair line in trade guidance does not turn a hardware-store aerosol into that specification.
What about thermal zinc spray? Is that the aerosol?
Thermal zinc spray is molten metal applied with a spray gun, usually after blasting, in the family of BS EN ISO 2063. The aerosol in a DIY aisle is a paint film. Hot-dip is the bath. If a quote says zinc spray, ask which process is priced. The three names are not the same job on a gate.
If the steel is already galvanised, which page do you read next?
Read the galvanised-steel repair page for a chip, a cut end, or a weld burn on a coating that is still sound. That page holds the 100 micrometre target and the zinc-percentage check. Stay here if you are still deciding whether the article should be dipped again.

Related pages

Best zinc spray

Zinc spray

Zinc spray buying guide: read the tin in this order

Zinc spray for galvanised steel chip and weld burn

How to use zinc spray: clean steel, then thin coats

Sources

Public sources named in the research digest. Shelf prices and review counts are from the amazon.co.uk saved listings for these five ASINs, not a live re-check on 16 October 2026.

  1. Galvanizers Association — Repair of galvanized steel (retrieved 16 October 2026)
  2. Galvanizers Association — Galvanized coating repair and renovation (retrieved 16 October 2026)
  3. Health and Safety Executive — Health risks of welding (retrieved 16 October 2026)
  4. Health and Safety Executive — Mild steel welding fume (retrieved 16 October 2026)
  5. Motip — Zinc spray (retrieved 16 October 2026)
  6. Hycote — Zinc primer technical sheet (retrieved 16 October 2026)
  7. Institute of Corrosion — Ask the expert (retrieved 16 October 2026)
  8. CLP Regulation, Annex III — hazard statements including H222 (retrieved 16 October 2026)