I think the #5 Ad Grey is pretty good myself. That is the grey I use as well as #15 Midnight Blue and #21 Black. I have used #14 French Blue for the stripes and looks much closer to the sandtrooper helmets. I read somewhere (from Jez I think) that they used the 'little pots' of paint for detailing the helmets. I can only think of Humbrol, Revell and Airfix paints and I don't think Airfix paints are available today and Revell don't do many colours in gloss.
Ken, I'll give you a few tips on painting the details mate
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1. I always paint the black outlines first on the traps and tears, working outwards making sure to get a nice clean line on the outer edge. Don't worry about the inside it will cover with the grey. Oh and the mouth doesn't have a black line around it
2. Paint in the chin area black and work outwards again until you are happy with the shape of the vocoder. There are many variations in the films so don't try to be too exact.
3. Fill in the teeth seperately with grey and no black out line
I try and fill the whole tooth and make them look bigger but they should look like seperate teeth and not one big 'mouth'.
4. Fill in the traps with the grey and try to keep the black line nice and even. When that's dried you can paint the black stripes. Again don't try too hard as they can be touched up with grey after it has dried.
5. Same things above apply to the ear caps.
6. Now the tube stripes. I place two strips of masking tape on each tube roughly 15mm apart and mark the stripes on the tape. The stripes are 3mm each and the spaces 4mm (on mine). I use a two pence piece and draw an pencil line around the coin all the up until all the stripes are done. You can have as many as 16 stripes or as little as 11 ( at least that is what I have counted from the found screen used helmets). Fill in the lines with either #15 blue or #14 blue and remover the tape when dry.
I would suggest buying decent paint brushes, a thin one for detailing and a thicker one for filling in. Also wait until each coat is dry before moving onto the next colour ir it could spell disaster.
-Paul