Rusty Radiator

buy a tin of nitromose, then paint onto radiator, leave for an hour untill the paint has gone soft, then using a thin scraper, scrape off paint. use gloves at all time and goggles nitromose is an irritant and avoid getting into eyes at all times please read instructions before using have a lovely day!

i’ve personally used zinsser cover stain to go over rust and it’s covered perfectly so i would recommend trying that

Before painting, everything must be thoroughly cleaned and rust removed. HAMMERITE RADIATOR ENAMEL METAL PAINT I order two coats

You should use just radiator paint or you can you use also any oil based paint. If you don't want rust anymore paint with zinsser bin paint first Red can.

Hiya
You can buy a Hammerite that are for radiators, or jenolite which you can buy on amazon.

Sticky Oily paint would be the best paint to use. And at least 2 to 3 coats.

The radiator needs replacing. Or needs completely scraping back to bone. All paint and enamel needs to come off. It then needs to be sanded, then sanded with wire wool and completely started again.
Enamel coating spray
Prime
Undercoat
Metal paint

But I would fully recommend a replacement radiator as this would out price the customer

Check there are leaks around the seams or valves of the radiator.
Radiators need to be thoroughly sanded down or treated with the paint remover as left over paint will probably bubble If just overpainted with enamel paint.
Use a radiator paint primer and ensure the coating is not stepped or overloaded with too much primer.
Best finish for a radiator is to use radiator spray canisters available from most DIY Stores such as Wickes, and B&Q.Soray in a smooth regular action 6-8 inches away from the radiator.Avoid hand brushing as this creates unsightly tramlines on the radiator, and irregular thickness of paint on the radiators angled metal structure.

Blue based coat primer about 4 coats then the colour of choice and u should be good there on

If you're dealing with rust on a radiator, you can use Hammerite Direct to Rust paint. Treat the rust first with a rust converter or remover, then apply a suitable primer before painting. This should help address the rust issue effectively.

Best option is to change the pipe completely

I would usually use a white vinegar apply to areas of the radiator leave it for a while the vinegar will dissolve the rust wipe it away I would then apply zinsser primer sealer stain killer let that dry then use you hammerite then your good to go.

In all honesty If the radiator is as bad as it reads I would advise the customer to replace the radiator

Not sure on how old the radiator is,it may be a lot cheaper to replace,you could always use a rustoleompaint or hammerite but it doesn’t mean it won’t come back through eventually again.

The radiator would need stripping back down and all Rust to be removed before painting with a radiator paint pacifically designed for radiators. Any other paint could crack and fire with the heat from the radiators.

I suggest to sand down all paint from radiator,apply one coat of primer and after that use good brand of radiator paint.

Rust or corrosion on radiators can occur due to two main reasons: leaks and a build-up of sludge inside the radiator. The presence of sludge, a black substance that accumulates over time if left untreated, not only affects the heating performance but also leads to internal rusting. This rust can create tiny holes in the radiator, causing leaks and potentially damaging other components such as the boiler, pump, and radiator valves. Additionally, sludge can cause blockages in the pipework.

The chemical reaction between water and steel or metals is what causes rust to form on radiators. To prevent this issue, regular maintenance is crucial. Here are some steps you can take to avoid rust formation and maintain your radiators:

If you are experiencing rust coming through the paint on your radiator even after repainting, it is crucial to address the underlying rust issue before applying a new coat of paint. Here’s a step-by-step guide to help you tackle this problem effectively:

Remove Existing Paint and Rust:

Start by using methods like white vinegar, tin foil, baking soda, lemon and salt, or sandpaper to remove the existing paint and rust from the radiator surface. These methods are effective in breaking down rust and preparing the surface for repainting.
If sandpaper is proving difficult due to thick layers of paint, consider using a more abrasive tool like a wire brush or a rotary tool with a sanding attachment to remove stubborn paint layers.
Apply Anti-Rust Primer:

Once you have removed the rust and old paint, apply an anti-rust primer specifically designed for metal surfaces. This primer will create a protective barrier against future rust formation and ensure better adhesion for the new paint.
Repaint the Radiator:

After allowing the primer to dry completely according to the manufacturer’s instructions, you can proceed to repaint the radiator with a suitable metal paint. Make sure to choose a high-quality paint that is durable and heat-resistant for radiators.
Apply multiple thin coats of paint rather than one thick coat for better coverage and longevity of the finish.
By following these steps diligently, you can effectively address the rust issue on your radiator and achieve a smooth, long-lasting finish that resists further rusting.

This can depend if it is interior paint I would recommend using a gloss paint personally for radiators and woodwork is this seems to have the best results I have not though personally come across a rusty radiator so I would not be able to give much advice as I have little experience in this matter pacifically

You need to use a suitable undercoat & primer to stop the rust bleeding through.
Just painting on top is not sufficent to hold the rust stains back.

Plenty of stain block primers on the market, x2 coats followed by x2 coats of desired finish.

Stain blocker then undercoat for radiator then finish with radiator paint.