Here's some more product & advice to add to the cornfusion...
For more, goog: bumper black paint...

http://www.superiorcarcare.net/forblacbumtr.html

http://www.tcpglobal.com/spraypaintd...-coatings.aspx

http://www.ehow.com/how_5143210_pain...ers-truck.html

http://www.abc-bus.com/servicebullet...20painting.pdf

http://www.bodyshopbusiness.com/Arti...g_plastic.aspx

http://www.urethanesupply.com/bccincompatible.php