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Also, what mixture ratios do you use when base coating using Citadel paints in an airbrush? ]]> http://www.dakkadakka.com/dakkaforum/posts/preList/591557/6757066.page http://www.dakkadakka.com/dakkaforum/posts/preList/591557/6757066.page GMT
As for metallicising, Vallejo do a metallic medium that should do what you want. Leadbelcher will work, but as it is in many respects a metallic black, it may alter the underlying colour of Screamer Pink more than the proper stuff.

Alternatively, put down a good coat of silver, then spray very thin coats of Screamer Pink over the top. ]]> http://www.dakkadakka.com/dakkaforum/posts/preList/591557/6757088.page http://www.dakkadakka.com/dakkaforum/posts/preList/591557/6757088.page GMT http://www.dakkadakka.com/dakkaforum/posts/preList/591557/6758615.page http://www.dakkadakka.com/dakkaforum/posts/preList/591557/6758615.page GMT http://www.dakkadakka.com/dakkaforum/posts/preList/591557/6758855.page http://www.dakkadakka.com/dakkaforum/posts/preList/591557/6758855.page GMT http://www.dakkadakka.com/dakkaforum/posts/preList/591557/6758980.page http://www.dakkadakka.com/dakkaforum/posts/preList/591557/6758980.page GMT http://www.dakkadakka.com/dakkaforum/posts/preList/591557/6759097.page http://www.dakkadakka.com/dakkaforum/posts/preList/591557/6759097.page GMT
This will hands down give you the best and most consistent results. However, it will prove hard to get it to match to Screamer pink exactly.

You could always try painting using pink NMM?

Edit ~ Also with regards to the mixtures for your Airbrush and Citadel metallics. I echo the comment from someone above saying they have never had much luck with getting them to go through. If you are going to try it, I suggest using a fabric paint seive/strainer before putting it into your airbrush, and possibly a drying retarder as well. Elsewise it clogs like hell.

Vallejo Model Air metallics are much less hassle and near enough.]]> http://www.dakkadakka.com/dakkaforum/posts/preList/591557/6759850.page http://www.dakkadakka.com/dakkaforum/posts/preList/591557/6759850.page GMT http://www.dakkadakka.com/dakkaforum/posts/preList/591557/6759935.page http://www.dakkadakka.com/dakkaforum/posts/preList/591557/6759935.page GMT