I think the coating point here is wrong already. Coating suppose to protect the paint, not maintain to protect the coating?
haha.. maintain the coating to protect the paint.
my take has always been the slightly more traditional way.
wash & wax weekly
Wax & polish & clay & wax monthly
full detail half yearly.
your car will shine like no tomorrow already. also, it will be cheaper.
if you do not have a the time, there are auto detailers out there. I do them myself (i burn calories!)
i find coating totally unjustifiable and the way the sell it is "we can repel water, its magic"
for me, the big step change in paint protection is NOT paint coating. but maybe clear bra. because there is no "top-up", no "maintenance", no "special care". its almost plug and play. the plus point is that it really protects! coating can never come close to clearbra's scratch test.