Back in the early 1970's,  George Barris decided to cover his four Batmobiles in "Bat-fuzz" paint.  This velvety, fuzzy finish was used on the cars to hide imperfections and give them a matte finish.

 

1976

Car #1

 Bob Kane and George Barris in the late 60's

Car #2

 #3 Batmobile

Car #3

 #4

Car #4