Heat dispersant paint

If you check makers cans I think necessary resistant temperatures range by a least 600 degrees C 200 C approx to 800 depending on the brand and type of finish! Suitable metallic flake paints probably can heat disperse well too. They used to paint a lot of things black supposedly to hold the heat and then radiate it out, but this may also be that it was a cheap finish for the factories!

Francis Beart used to fit cooling rings and finned muffs to the hubs and apparently when testing a 7R and a G50 out on the track, the cooling ring properly attached at the front made a big difference in heat dissipation.

Personally I like Gold and Silver or metallic finishes of either and then there is Spray chrome discussed elsewhere, but I am not sure about HR properties, For race engines David Vizard use to have all inlet manifolds chromed to cool the incoming air!

Did my own research off Ebay, prices for products and volume vary tremendously!

Acid etch primer 200 C,

Rustins Black 600 C,

Heat Resistant Caliper paint 190 C,

Wood burner stove paint 600 C,

Rustoleum spray BBQ 650 c,

Matt black stove paint 800 C,

Engine Enamel 250 C.

Silver High Temperature spray 650 C suitable for exhaust pipes apparently!

However, some paint will state that they are not suitable for aluminium.

Lidl's Baufix (I think) spray aluminium paint is the best I have come across. I sprayed a Land Rover exhaust from end to end over a year ago and the finish is still ecxellent.

In that case, the only one that stands actual use in my experience is Hammerite smooth.

Heat dispersant properties are more to do with the properties of the material being painted and the properties, colour and metal content of the paint. If you are using matt black then I believe, it works on the principle that it holds the heat to it by absorption and therefore if the area to be cooled has say an increased surface area through finning, cooling air passing over it removes the heat held in the black painted area, which supposedly leads to more efficient cooling!

As for heat dispersal, I believe that Gold itself and Gold coloured metalflake paint compounds, which have to be heat resistant or they will blister off,(that is the whole point of being HR to stick to the material you have painted it to) are deemed very good at dispersing heat. As are Silver and aluminium type finishes.

The whole thing about the movement of heat, is Hot moves to cold or cooler, you only have three processes to do this, conduction, convection and radiation, but the first principle in practice is that whatever you use, has to stick successfully to the material to be cooled in the first place!