Someone on this list, and I won't use his initials so you won't know who I'm
talking about, was a bit sloppy applying an epoxy primer betwix the front
bumper and the lower grill.  Since there is little space to work, and fine
bits of primer to remove, I was at a quandary as how to reach in and do
finite sanding to hide or remove the mistake.  Then I remembered Sanding
Sticks, and small work became soooo much easier.  I get mine from Woodcraft,
as they are near me.
http://www.woodcraft.com/Product/2000274/1744/24-Piece-Standard-Kit-Sanding-Sticks.aspx

This tool is a must for really small areas.
ed- who has kept the name cleverly hidden from all but the most fiendish
cryptographers