Decaling Help

Future was a floor coating that was used like a wax. It is now sold under a different brand name, Pledge was the last brand I saw, and the container said "contains Future" .  It is actually a clear acrylic coating rather than a wax.

Whether you coat all or just areas of a model depends on how extensive the decals are. If just a few, coating just those areas is okay- if extensive, it is easier to just coat the whole thing.  As far as other methods, no setting solution or solvent is as reliable to prevent silvering as applying to a gloss  surface.

A flat coat dulls the finish to prevent specular reflections. It does the opposite from making something glossy.  Gloss coat, on the other hand, is the opposite to dull coat.  Some military models need to look flat when finished, and since you need to apply the decals to a gloss surface, flat clears give you the needed flat/matt appearance.  BTW, if you can get the colors you need in a gloss paint, some folks just paint the models gloss, apply the decals, and then flat coat.

 Which flat coat you use depends on what type of paint you have used.

Some people use a final clear coat after weathering, others do not. It is not a big difference.