Placing Decals on AK Extreme Metal

Finished painting my P51 in Extreme Metal and was wondering if you spray the plane with Future like on Acrylics for the decal placement or do the decals just go on the bare metal?

Never used the AK stuff, but on Alclad I do not bother to gloss it. Decals go down very well on the surface, and adhere well too.

I’ll give it a try tomorrow. Thanks