Here's a tip for those Pitbull decal users. This product is called Micro Sol. Its a decal setting solution that is mainly used in the scale modelling scene. It allows the decal to conform to different shapes and basically makes the decal look painted on.
For the best results, I first apply Micro Sol to the prepared the surface. Make sure the surface is free of particles that could get under the decal's film and cause a blemish. Then, when everything is dry enough that the decal will not move easily, apply Micro Sol with a small flat brush. Apply with as few strokes as possible so a not to disturb the decal. Then allow the decal to dry without disturbing it. One application is enough in most cases, but if necessary, a second application of Micro Sol can be helpful.
You can pick this stuff up from decent hobby shops.