Board Thread:Questions and Answers/@comment-73.53.20.183-20171112024806/@comment-24659725-20171112221518

Mastery; they only go on specific cars, check which cars you can use them on by tapping on the decal in the mastery screen, when on the car's decals, it's mastery decals will be at the very end of the decal menu.

Event; they will be on the car you claimed them for, either they will be at the end like the mastery because they are hidden, or they will just be a normal decal for free.