Here's a short vid I did a short while ago about how I go about applying Tamiya chalks for "aztecing"...
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USS Voyager WIP Vid - 008 by Steve J, on Flickr
Since then...
Finished chalking the trench. Masked off around the rim panels for easier cleanup. Have begun chalking same:
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USS Voyager WIP Img - 340 by Steve J, on Flickr
Lower saucer aztec (?) complete and shot with Dulcote to seal. Just a few more areas that may need some aztecing
and then I can airbrush a thin coat of the light grey mix "A" over all:
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USS Voyager WIP Img - 341 by Steve J, on Flickr