Also if your interested in more the company hyperstealth appears to do great work in this realm. http://www.hyperstealth.com/c3/
Also here is an interesting paper on oxide nanoparticles and their NIR properties.
just beware some nanoparticles may be a health hazard prior to proper binding.
I also put a small bit of paint onto a few sudden death ships that have been sitting on my desk forever screaming at me to start painting again.
Now the question, do I paint another nerf or move on to an airsoft rifle.