I don't . Some do . The old nostalgia drag cars either had their logos painted on or were vinyl decaled . This gave a raised appearance from an angle.It is a realistic appearance . If your decals are not laid down perfectly , wherever there is a lip or raised edge , it will most likely form a fisheye once the clear is applied.
Any debris trapped in the clear is tough to get out , especially if it is in the first few coats . It is easy enough to replace a decal if it is cracked , crooked , etc, without the clear coat. Once the clear coat is on , you are stuck with the results . Another occurance , some types of clear will attack the decal and ruin it .
I am glad you enjoyed the dvd , follow the steps and it will become a joy to airbrush rather than a chore !
Lone Wolf Custom Painting
Contact me at .... oldmansmodels.com