The fact that your decals NEVER has prio against spraypaint is downright annoying, and having it permalocked annoys me even more as i cant have the decals as a "Finish" but instead they just fall behind the paint.
Other than that ive noticed that decals get some weird texture when stretched (Ordinary Square is my best example) where it starts to become seethrough at some sports and getting triangles everywhere.
On the Buggy there seems to be a bug at some spots on the car aswell where if you paint it close to the driver doors (Between the front left fender and the door at the crevace) the color shoots up in a line up the door which cant be fixed.
And adjusting decals at all seems to be wonky at the moment aswell (Atleast for me they shake like theyve been taking a dive near the North Pole)
On a positive note however, im very freaking happy that you give us free reign over our cars customisation now, even if its wonky in the first release im sure that it will become a fine addition to the game!