Tips for Jet Exhaust Nozzles?

On my he 162 I used dark and light burnt iron from alclad to give a bit more frrl to the different heat areas.

On a nozle with pettals I would do a darker wash insode the oberlaps of the petals to give some shadows.

Most exhausts I have seen are a matt to semi satin look to it.

Revell 1/32 HE 162 by Theunis van Vuuren, on Flickr

Theuns

Oxboy

I'm doing a Harrier GR.3 and have zero idea what to do with these

Keep in mind that the forward nozzles on a Harrier pass relatively cool bypass air, so there is little, if any heat discolouration on those. 

Also note that there is often heat discolouration/sooting on the fuselage side heat shields/deflectors behind the aft nozzles.

For the exhaust I used alclad burnt iron and highlited the pettals with a graphite pencil to look "metal" the pix dont really reflect the look as well.

IMG_20180603_120847 by Theunis van Vuuren, on Flickr

On the indise I did the same but added tamiya smoke to tone it down a little.

IMG_20180603_120826 by Theunis van Vuuren, on Flickr

Theuns

Alclad makes a Jet Exhaust color that works very well for this purpose. You can experiment with different colors and weathing producst to achieve the look you want.

BK