What can I say guys? I'm a wild man? I'm a rebel? And it's even worse than my doing an oil washes on the flat coat. I rarely apply a gloss coat after the decals. I normally go straight to the flat coat. The only time I do a coat of Future immediately after decals is if they are thick decals and I want to get a build up of Future around the decals to hide the thick carrier film.
Seriously, I've never had any trouble with my oil washes affecting my paint jobs. I even just did a pretty heavy "filter" on a Harrier I am working on to get more of a blue tone than I ended up with after the paint. That went on straight over the Tamiya. I use what seems to be a pretty mild thinner, Napatha, and it seems pretty safe with the acrylics. I also like the effects I get by doing the panel lines with the flat coat. If you do them with a gloss coat, it's real easy to confine the effect to just the recessed line. But if you do it over the flat coat, it's real easy to replicate fluid and dust streaks by drawing any over run back in the direction of the theoretical airflow. If you do that with a gloss coat on, you tend to wipe the streak away. With the flat coat, some of the wash gets caught in the grit of the flat coat. Same with a fluid spill. If you let a drop of oil wash onto a gloss coat, it will bead up; but do it on a flat coat and the grit of the flat coat acts like capillary action in a panel line and draws the drop outward. Several drops overlapped as they dry will leave overlapping fluid rings or halos. You can't see it in the picture of the Corsair, but I did that on the foward fuselage and a bit on the wings to replicate fluid stains.
Besides, as far as protecting the paint, what's the difference between Future, and a modeling acrylic flat coat? They are both acrylic and should react in similar ways to the oil wash. To me, the difference isn't in the level of protection afforded to the paint, but with how the oil wash behaves.
On another note, David, let me know how you like the Future/Tamiya Flat Base combo. I've got some Flat base and have been condsidering trying that, but have heard some horror stories of getting the ratio off (as in too much flat base) and frosting the model.
Mike Moore