No one else has mentioned this so I will, why 7 layers of #7? It is a great product but, any more than 2 layers is pretty much a waste of time. It is not possible to build up a thick layer of #7. #7 does not dry like a wax. The best way to describe it is that it skins like pudding left in the fridge. The act of applying another layer of #7 will re-liquify any previous layers and they will flow together and excess wiped off. The only benefit to layering #7 is to ensure complete coverage, not to build a thick layer.
As to NXT removing your S100 and #7. Sure it will probably remove a bit of the S100 but, most likely a very small amount as the cleaners in it are very very light.