Thanks Chris.
Could you please assist me with my two remaining questions? Many thanks!
2) Can I use the coat on plastic wheel covers? Not the actual rim?
3) Can I also coat my chrome plated exterior ABS parts? My weathershield visor?
It's not exactly secured purely by double-stick tapes. My i30's OEM rear spoiler also have end flat metal hooks that are secured to the edge of the roof. Plus the tapes I'm using isn't some knockoff stuff, but proper 3M Automotive Tapes. Will use more than enough tapes based on specifications (adhesive strength for given area and weight of attachment) so I wouldn't have a flying spoiler anytime.

Don't want to get myself in trouble of course. The surface will be properly prepped as well. (there is no need to use primer as well)
This is why I'm asking the Opti-Coat 2.0 question and if it will affect the durability of these 3M automotive tapes.