I used liquid sandpaper, basically a de-glosser to prep, then wipe clean. Did four light coats "after each dried", that is important part....Good luck.
Nothing to it but to do it.
SIMPLE AS THAT.
'04 TJ RUBICON, 4.0l auto
2"BDS coils, Rubicon express shocks, 33/12.50/15 Dick Cepek Mud Country tires yellowed out, on Black steel D's.