Next question - rusting exhaust

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The exhaust pipe on my NC24 is seriously rusted. It seems to be structurally sound, but aesthetically very displeasing. I've done a search and read a bit about autosol, liquid metal, hammerite, VHT spraypaint etc - but I'm not sure which I should use and when.

-Hammerite as I understand it is rust removal, right? So I would stick that on to begin with to remove any rust?
-Then, if it looks a bit shit, I could use liquid metal right? Stick that on and sand it down to basically a circle shape so it fits in.
-Then, if the liquid metal isn't a pleasing colour I'd use the VHT spraypaint?

Have I understood that right? Any advice much appreciated...
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[el_oso]

hammerite is a brand.
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Duke 390
Previous: '05 XR125L | '96 XJ600S Diversion |'05 Suzuki GSXR1000 | '05 Honda CBR125-R | '97 YZF 600R Thundercat | '11 Honda CBR250
Car: Jeep Wrangler 4.0L

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[Amreet]

'Hammerite' is a brand that, amongst other things, mainly sells rust preventative paints. So putting hammerite on wont get rid of rust itself, itll just cover it up with paint. Hammerite do sell a product called 'Curust' i think (??) which is meant to remove rust and leave a bare metal surface but I have never had much luck with it.

get rid of the rust with a wire brush and any rust removal product, look for holes and patch if necessary with any method, exhaust putty/liquid metal or weld a patch on if its a big hole. if its rusted badly, the bare metal surface will probably look terrible and it will also be prone to rusting again (ironically, rust kinda protects the metal underneath from rusting, so removing the rust just gives the metal that was previously coated with a layer of oxide a chance to rust, which could actually start to create (more/bigger) holes in the exhaust, so you should paint it with some some sort of rust preventative.

Hammerite is the standard thing to use, they do sell high tempterature paint (500 degree +) for exhausts and engines but Ive never had any problems with using regular hammerite on downpipes, looks pretty bad after a while ago so new stainless pipes are the best thing aesthetically.

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[baldy]

Sandblast it and then use B&Q bbq paint. Much better than vht stuff. It's a lot thicker and lasts forever. It lasted well over 2 years on my xr in all weathers before rust started to show.

Never again will i buy standard vht paint.
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One day i will rule the world, just not today.

[neil.]

Get some kitchen towel, soak it in vinegar, wrap around downpipes, leave for a day or so, then scrub to remove rust. Might need a few attempts if it's really bad but certainly the cheapest way to do it.

[DrDonnyBrago]

Hammerite is a brand of paint suitable for rusty metal, but the most common ones will melt at anything approaching hot.

BBQ paint seems the way to go, I had VHT paint on some down pipes of mine and it burnt off pretty quickly.

Rust treatments vary, the best ones IMO are the phosphoric acid based treatments. These dissolve rust easily but take ages to dissolve the parent metal so you can leave them on there a bit longer.

Chemical metal is normally epoxy glue with bits of metal in it. It isn't really suitable for high temperature applications, I stuck a blob on the headers of my car to see if it would take the heat, it fell off within a week. A decent exhaust repair paste (gun gum) would be a better bet if you have a hole whilst welding it would be better again. If it has got to the point where holes are forming then the pipe is probably rusted so bad it could do with replacing as the rust will be coming from the inside as well as the outside.

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[DrDonnyBrago]

[calyx]