Hammerite a rad?

[BRUC3]

I've just cleaned up the rad on my
Geep and want to paint the top part of it as it's old and crusty! Will hammerite he okay, or will I nee to use high temp paint?

Also does anyone have any secret tips on how to clean out the fins? Ad once done could I give it a light mist of black paint?

 

[HolyCount]

I think Frost Restorations do a rad spray paint.