yeah rmichael pretty much sums it up. This subject is like opening a can of worms. It involves way too many variables like shear viscometry, quasi-2-D flow fields, phenomenology, toroidal vortexs, standoff distance, fluid-dynamic phenomena of wavy-sheet breakup, various polymer thickeners, spray entrainment, spray impingement, inertial droplet impaction etc., some of which beyond my scope of knowledge but I have a good understanding of it.
And its not fully understood in the first place so its a work in progress. I think that what maybe the SW rep might be getting at is to closely keep the cans content in tack by shooting with a
x15. Cant argue that. There is truth in that. Because really, even shooting 2 coats of say Duration with a FF wont be the same as 1 coat shot with
x15 but the finish will be superior with FF tips. In theory.