it may or may not be sierraglow's fault. you really need to read up and understand detailing before you start shooting faults/blames

if you want to be ignorant on the issue there is no helping it then

if you'd like to know anyways:
- washing with improper method will damage paint/coating in the long run
- parking under shade means nothing if you drive your car a lot. unless you're gonna tell me that car is a showroom car and never drives outside.

whoever is applying SG should be informing to you instead then.

in any form of car detailing, maintenance is always the hardest step. same applies to SG or even optimum/ONR products that is rather famous in LYN. at you still need to spend at least 30mins every week to do car wash/quick detailing (be it spray-ons and what not)

blatant claims on "easy to maintain" without proper understanding given is just bullshit in my book
however from your attitude of warning, and the whole "i dont want to listen/understand/solution, only want to 'warn others' " is just in bad taste imo