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Hi Steve,
there are several method to elimate this silvering effect. Decals are best to be applied to a glossy surface. The most preffered method is to coat your model with a gloss clear coat prior to decalling. Used any of your favourite gloss coat, but many modeller prefer to use Future (a household product for polishing floor).
Steve,
In the UK "Future" is sold as "Johnson's Klear".
The reason decals silver when put on a matt surface is because of microscopic air pockets in the "grain" of the matt finish under the decal - using a gloss surface (Klear, gloss varnish, glossy paints, whichever you prefer) and a decal setting solution (I use Microsol) helps eliminate this.
I paint the model's base colour, coat with Klear and leave for 48hrs minimun. Then I add the decal with plenty of decal solution and allow 24hrs to set. Then I add another coat of Klear, allow another 48hrs and then add washes before spraying with matt varnish (I find a coating of Klear helps washes "flow").
Hope that helps, mate.