Radiator paint fail

[Murphy]

Attached (hopefully) is a pic of the left hand side of the radiator. As you can see, the paint has failed and exposed the corroded ally of the side of the rad.
My question is; what’s the best way to deal with this? In my head I have a range of answers beginning with light wet and dry, Hammerite alloy primer and Hammerite, all the way through remove rad and re-spray to new rad (ouch)

[Hound]

I have a similar problem. I was just going to key the surface and paint with Granville satin black high-temp
cylinder/engine/exhaust paint. No need for primer, it's designed to be painted straight onto metal. You may
get a few brush marks, but it's almost all hidden by the radiator shroud anyway.

Alternatively there's satin black Hammerite Direct To Rust paint. It's primer, undercoat and topcoat all in one.
I don't know its heat resistance, but I doubt the radiator edges get all that hot.

[Murphy]

Update; so I rubbed down with 80 grit W & D, then 180, making sure to remove ALL the flaked paint and nearly all the oxide. Cleaned it down then acetone to degrease thoroughly. Now there is Hammerite special metals primer. Says it’s designed for aluminium etc. Black Hammerite tomorrow.
The other side was exactly the same.

[Hartley]

I had this exact same issue on my CT just prior to me selling it.

[Murphy]

Originally Posted by Hartley

I had this exact same issue on my CT just prior to me selling it.

Sounds ominous!

[t15dja]

Seems like it may be a not uncommon issue. I would like to try and prevent this happening to my 2020 CT. Would you say it is a failure of the paint adhesion to the rad or is it corrosion from the outside? If the latter it may be prevented / delayed by liberal application of ACF50?

[thetrecker]

this happens them all, I sprayed acf50 on it and it still happened. Repainting works for a while.
It seems paint is not happy sticking to the rad material.

Tom

[Murphy]

It looks like powder coat fail. It’s in a very vulnerable spot, especially where there is salt on the roads. I’ve always tried to wash the bike after wet use, especially in winter, but these areas are quite hidden under the plastic add ons so it’s difficult to see, let alone clean.
I’m anticipating having to put a new rad on in a couple of years time, given that the whole thing is alloy. That’s if I haven’t turned traitor and gotten one of the new Triumph 1200 GT Pro’s.