Flat finish

Its more a question of preferrence, gbritnell. Ask 10 modellers, and you'll probably get 10 different answers.
Most, if not all, paint manufacturers produce their own flat finish coat. My suggestion would be to buy a couple of different ones, and test the results on an unwanted kit or part. Spray it over a coat of Future, and see if you get the results you desire.
I have always had good luck with Testors Dullcoat lacquer.
Hope this helps. Good luck.

I would suggest Testors dullcote as well because it sprays well when airbrused, easy to use and it's bottle size is economical. I have been using Testors clear laquer finishes exclusively and at shows modelers are very surprised to find out that my award winning models were finished with Testors clear laquers. Give them a try, you'll like them!

You can take the finish back to dull by mixing Future and Tamiya Flat Base X-21. It's less volitile than that stuff in a can, you can airbrush it and the degrees of gloss/dull are infinite plus you can thin it with alcohol so that it doesn't fill in your panel lines and other detail. 10% X-21 to 90% Future is pretty glossy, 50/50 is ultra flat. Play with the mixture to get the sheen you're after.

-fish