While not a true torture test at this point, my daughter's car is going on four months of various weather conditions, 24/7 exposure to the elements, and 2~3 touchless washes and there doesn't seem to be any change in water behavior.
I would expect touchless washes won't have much effect. Collinite 845 will get me through 5~6 months of winter weather and repeated touchless washes. If a coating can't beat the durability of a wax/sealant in common conditions, then I really don't see the point in bothering to use them.
I am considering the spray able Paint Coating. My question is: How does it hold up to harsher chemicals like touch-less washes?
Great question. McKee's 37 Paint Coating will hold up quite well to touch-less washes.
I would encourage you to refresh the coating every so often with McKee's 37 High Gloss Detail Spray. This will produce an even stronger hydrophobic surface that will cause water to run like....well you know.