Top Coat

yeah: Future, then decal,
then tamiya flat base + future 1:3 for dead flat, which I believe you would want

You need to place your decals and wash on a smooth, glossy surface or you are liable to get silvering in the decals because of the matte finish. The weathering will be difficult to remove if it is on a flat surface as well.

My recommendation would be to use Future to get a smooth finish, place your decals and then do whatever washing and weathering you intend to do, and finally spray everything with a coat of flat acrylic clear.

Ryan, would I mix the tamiya clear flat + future,or use them seperately at the end?
thank you
T.W.

I suggest you use future then wash and decals then tamiya clear flat + future