The bubble effect can happen when decals are applied. Once the decals have been applied, you might find
that you have small air bubbles between the decal and the vehicle
surface. Most smaller bubbles will disappear within a few days or so, larger
bubbles can be removed by poking a pin through the surface and smoothing
out the air with your fingers or squeegee. Any debris under the vinlyl when applied can be noticed and may appear to be a bubble.