---
title: "Which paint should I use on radiators?"
description: "A radiator enamel — water-based acrylic ones no longer yellow, which ordinary gloss on a hot surface always will. The ranked options, the technique that changes the "
url: https://atoneplace.net/which/paint-radiators/
site: "At One Place"
---

# Which paint should I use on radiators?

**Which paint should I use on radiators?: A radiator enamel — water-based acrylic ones no longer yellow, which ordinary gloss on a hot surface always will.**

The rule that matters is that the radiator must be cold, off and preferably fully cooled overnight before painting, and left to cure before the heating goes back on. Painting a warm radiator makes the solvent flash off before the paint has levelled, giving a ridged finish, and heating a fresh film traps solvent and produces the smell that lingers for weeks. Ordinary oil-based gloss yellows in the dark and yellows faster when hot, which is why radiators behind curtains and furniture discolour first. A coat of paint reduces heat output very slightly — a few per cent at most — and that is dominated by colour and surface texture rather than by the paint being present.

## The options, ranked

*Ranked best-first for the stated job. The third column is why the others exist.*

| Option | Good at | Bad at |
| --- | --- | --- |
| Water-based radiator enamel | Formulated to stay white at radiator temperatures, low odour, and quick to recoat. | Slightly less hard than solvent-based enamel until it has fully cured over a few weeks. |
| Solvent-based radiator enamel | Very hard, flows out beautifully to a smooth film. | Strong smell in a room you have to live in, and it can still yellow slightly out of daylight. |
| Ordinary emulsion | Matches the wall colour exactly if the radiator is meant to disappear. | Not designed for heat, so it discolours and can soften; use only with a heat-tolerant clear coat if at all. |
| Radiator spray | Even coverage over the fins and columns of a shaped radiator that a brush cannot reach. | Requires masking a whole room, and the radiator ideally comes off the wall. |

## Technique that changes the outcome

1. Turn the heating off and let the radiator cool completely
2. Wash off dust and grease, then key the existing finish with a fine abrasive pad
3. Prime bare or rusted patches with a metal primer first
4. Two thin coats, and leave the heating off until the recoat and cure times have passed

## What goes wrong

- Painting a warm radiator
- Painting the valves or a thermostatic valve head, which stops it sensing the room correctly
- Ordinary oil-based gloss if you want it to stay white

> Compiled practical guidance rather than a published standard. Product formulations vary by brand and market, so read the label — and where the work is structural, electrical or gas, the regulations that apply where you are govern rather than anything here.

## Other paint questions

| For | Use |
| --- | --- |
| Previously painted wood | Clean it, key it and spot-prime bare areas — and find out first whether the existing paint is oil or water based. |
| Bare wood | Knotting solution on the knots, a wood primer, then your topcoat — and prime end grain twice. |
| Plastic | Any paint, provided an adhesion promoter goes on first — and on polypropylene or polyethylene, the promoter is not optional. |
| Kitchens | A scrubbable acrylic eggshell or satin on the walls — and for cabinets, degrease, prime and use a proper cabinet enamel. |
| Bathrooms | A moisture-resistant acrylic in a satin or eggshell sheen with a mould inhibitor — but ventilation, not paint, is the actual fix. |
| Metal | Remove the rust, apply a rust-inhibiting primer the same day, then an alkyd or a direct-to-metal acrylic. |
| Ceilings | A flat matt emulsion — and if there is a water stain or nicotine, seal it with a shellac-based stain block first. |
| Tiles | Tile paint over an epoxy or adhesion primer on a thoroughly degreased and abraded glaze — and expect a limited life in a shower. |
| Fences | A penetrating stain or fence treatment rather than a film-forming paint — and let new pressure-treated timber weather first. |
| Floors | Two-pack epoxy on concrete after a moisture test and a proper grind; floor-grade varnish or floor paint on timber. |
| Exterior masonry | A breathable mineral or masonry paint — and on an old solid wall, breathability matters more than any durability claim. |
| Galvanised metal | A mordant wash, a self-etch primer or a purpose-made acrylic primer for galvanising — ordinary oil-based primer peels off in sheets. |
| UPVC | A uPVC-specific paint or an adhesion promoter with an acrylic topcoat — and avoid dark colours, which can distort the frame. |

## Common questions

### Which paint should I use on radiators?

A radiator enamel — water-based acrylic ones no longer yellow, which ordinary gloss on a hot surface always will.

### What should I avoid?

Painting a warm radiator Painting the valves or a thermostatic valve head, which stops it sensing the room correctly Ordinary oil-based gloss if you want it to stay white

## Related pages

- [Which paint goes over previously painted wood?](https://atoneplace.net/which/paint-painted-wood/)
- [Which paint should I use on bare wood?](https://atoneplace.net/which/paint-bare-wood/)
- [Which paint sticks to plastic?](https://atoneplace.net/which/paint-plastic/)
- [Which paint should I use in a kitchen?](https://atoneplace.net/which/paint-kitchen/)
- [Which paint should I use in a bathroom?](https://atoneplace.net/which/paint-bathroom/)
- [Which paint should I use on metal?](https://atoneplace.net/which/paint-metal/)
- [Which paint should I use on a ceiling?](https://atoneplace.net/which/paint-ceiling/)
- [Which paint can I use on tiles?](https://atoneplace.net/which/paint-tiles/)
- [Which paint should I use on a fence?](https://atoneplace.net/which/paint-fence/)
- [Which paint should I use on a floor?](https://atoneplace.net/which/paint-floor/)

## Sources

- Typical range compiled from manufacturer specifications — At One Place (/about/)