Plasticjunkie
The gloss coat makes the pin wash on the panel lines flow smoother. I find that pin washing over a flat finish will wick the pin wash along the panel line sides on to the surrounding area.
I like to thin Future with alcohol or Windex cause it seems to spray much smoother than if not thinned.
Just about any clear coat or paint needs to be thinned to properly cycle thru the AB. You just have to experiment and see what works for you. I usually start at a 50/50 mix and go from there.
This is why I don't do panel washes. On real aircraft you don't see this unless there's an oil leak which is also another reason why I don't do it. Also I don't use anything in a jar, except for Creatix, Apple Barrel, Plaid, or other water based acrylics since paints have a tendency to separate. With spray paint you just shake it, and go - no thinning needed to get a nice smooth finish. Otherwise you'll want to use MINERAL SPIRITS to thin enamel paint as this is what they're formulated with. Acrylic paints will clean up with these, as well as isopropyl rubbing alcohol. Try this istead of floor polish since you're simply gambling with your finish, and your model by doing so.
~ Cobra Chris