In short, if you like the shiny shiny new look or want to further enhance the lustre, coating can help.

If for the purpose of protection, despite whatever level hardness advertise, you'll feel conned.

I wanted to do coating, and did some research and asking around. I ended up not doing it as you need to pay more attention to the "coating protection", which beats the purpose of applying it anyway.

Bird poo, rain stains, chipping, scratch protection are pretty mere marketing talk. The vendor will inform you that must immediately clean it off or else will leave a mark (My mind was like "huh!!? What the heck? Have to baby it even more than without coating")

The coating layer is so thin, almost no effect to environmental damage.

So again to summarise, coating for the purpose of maintaining/enhancing the shine, yes go do it. For main purpose of protection, you'll be disappointed.

TS, better that you get a recoat of the clear coat to better range like this :
https://automotive.nipponpaint.com.my/produ...=nax_premila_2k

(look under "top coat clear")

Likely cost lesser than those so called "coatings" and may last better as just maintain like regular. This product should be even better than those from factory.