Can this be used on a radiator?

I have looked on the tin and done a bit of research as well. The tin says: good for bare or rusty iron and steel. For use on aluminium, galvanised and non-ferrous metals, use other products. This is where it gets tricky, old, pre 1970s radiators used cast iron and steel. After the 1970s, a lot of modern radiators use copper pipes with aluminium fins. So, just check your radiators. I just did a test of my modern ones (2007) and the fins look like they are inside and using a magnet on the outside (which stuck) I reckon that is steel. I would therefore assume I can use the Hammerite here. So, just do a magnet check and if you are happy you can try that. Have a look on the Hammerite website also. I did, my initial findings were that they were just selling the gloss top coat. You can research this more yourself if you like. Just remember though as I have stated above, the tin says this is good for iron & steel bare or rusty metal but NOT for aluminium, galvanised or non-ferrous metals (use another product for these). Hope this helps you.

Will this be ok under a coat of enamel paint on an engine.

Probably. I don't know how it behaves at high temperatures but the outside of your engine shouldn't get too much over 100C.

I want to paint a metal window white . Can I use this first then cover with undercoat and final coat in white without it showing through .

Yes you can. I rubbed down the metal first, no dust, nothing but metal, then used the primer. The next day, first coat of white, which did not cover the red oxide perfectly; but a second coat 6 hours later gave a marvellous finish. I've just bought some more, to do up our old iron garden bench.

can I use this on my garage door and then paint a gloss paint over it please

I wouldn't use this if the door is smooth/new bare metal.

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✨ Revive Your Metal with Hammerite Magic! ✨

TRUSTED BRAND - Hammerite—your go-to for metal care since 1984!
GENEROUS COVERAGE - 500ml covers up to 6m²—ideal for small projects!
VERSATILE COVERAGE - Perfect for BBQs, railings, and more!
EFFORTLESS APPLICATION - Minimal prep needed—just brush and go!
TRANSFORM RUST TO RADIANCE - Paint directly on rust for a flawless finish!

Hammerite Primer - Red Oxide is a high-performance metal primer designed for both interior and exterior use. This 500ml tin features a quick-drying, rust-inhibiting formula that allows you to paint directly over rusted surfaces, providing excellent coverage and protection for various metal items like garden furniture, radiators, and fences.

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Manufacturer	Hammerite
Brand	Hammerite
Model	5092844
Product Dimensions	10 x 8.9 x 8.9 cm; 700 g
Item model number	5092844
Exterior	Steel
Manufacturer part number	5092844
Special Features	Fast-Drying, Rust Resistant
Item Weight	700 g

Hammerite Primer - Red Oxide. Metal Primer for Garden Furniture, Radiator and Fence Paint. Rust Inhibitor and Rust Treatment for Metal, Interior and Exterior Use - 500ml

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