Depends how you paint them. People who don't know what they are doing spray vht on and call it quits.
Proper way to do it is 3-4 coats of vht, 4 coats of clear. Wet sand and buff.
I have done about 10 sets now with no issues.
http://i477.photobucket.com/albums/rr133/probin007/163173A2-644C-45B0-A32E-97B490F152DB-6300-0000062A8BA88E97.jpg
http://i477.photobucket.com/albums/rr133/probin007/F1CA450D-2A6E-4E7F-A059-8FEC040DB321-6300-0000062A7BBB64D5.jpg