I painted the inside of the M100 bed with RustO Dark Olive
I picked the paint up at Home depot it was only $7.87 a QT.
I not sure about the color yet ,I still like the Krylon Olive Green #4293.
But I had to paint over the POR15 to protect it from the sun.
The Krylon paint comes in the gallen and is $33 It comes in a QT $8.99
but I have to order 2. So I'll have to see.