Things you can't apply coating to

[Kairi ♡]

-Flamethrower;
-Deatomizer;
-all items in shield slot;
-all armor pieces;

While I can understand reasoning behind Deatomizer being on this list, why everything else?

[Simple Tora]

I think they're intended to be WEAPON coatings is why. Deatomizer and Flamethrower both do insane multihits is my guess why they can't be coated it would be kinda busted

[Ov Å̪e̞oη̣s]

could be neat for armour though, effects when getting hit. Maybe some fun on hit chance ones.