It seems a lot of people are buying such coatings and doing it themselves.

10cc's of Opti-Coat can be had for about $50 - $60 even on Amazon.

I don't have the skill set to do a whole car or the patience anymore, but problem areas such as the sills, headlights, and wheels seem like a doable project. If your car is new or needs very little paint correction then yes.

I plan on powdercoating some wheels and then adding Opti Coat to make it very easy to spray off brake dust - would do painted calipers also.

Even though I am not a detailing expert I have found that nowadays anytime you count on someone else to do anything for you, so are screwed.