Okay, let me say it with a picture, in the case of my current Hurst Olds project, I wetsanded my paint with the Micro Mesh system, added my decals and polished everything including the decals. You can also finish with wax if you so desire. The thing is, you should be okay to place your decals after wetsanding the car and then worry about your polishing and waxing at the end. Just make sure that your decals are completely dry, in my case, I waited a whole day for this. I could have waited a few hours, didn't want to....
Hosted on Fotki
Hosted on Fotki
Hosted on Fotki
Hosted on Fotki
It's hard to see the gloss since it's painted white but believe me,it's there, this car does not have any clear added to the paint. I believe that once you polish and wax the car at the end with your decals in place, you will like how everything just blends in nicely. Decals don't stick too well on waxed surfaces, just stay away from that and you should be okay!!!