Is spraying a coat of clear sealer (ie) "Future or Dullcoat" ontop of Tamiya or any other acrylics a "set in stone rule" that needs to be done before an oil wash is applied to a model for the best results in the weathering process .. Or .. can oil washes be successfully applied on top of acrylics .. without the clear coat .. with good results, as long as the acrylic bottom coat has fully cured?
Also if the oil wash can indeed be applied over the acrylic bottom coat without the acrylics "lifting up" is there a positive difference in the effects of doing the wash proceedure this way?
I'm hoping that someone can tell me about this who has already had experience with it, either good or bad. It seems like I read somewhere that some modelers do their washes without a clear coat and the final camo finish after everything cured had more of a softer and realistic "hue" if that makes sense

Please don't hesitate to chime in and let me know if what I am asking is doable or not. It's just something that I was thinking about trying, but I was hoping that I could get a better idea of how to actually pull it off, if it can be done.
Thanks