Easiest to use by hand would likely be Mother's FX SynWax, I think.
Are you doing this by hand or machine? If by hand, you may want to look at one that fills instead of removes marring. Clearkote's Vanilla Moose is pretty nice in this regard.
If you are using a machine, then, as Dwayne mentioned, something that can fix as well as protect would be better.
PB's PwS does this. Doesn't have to be used only in the shade.