Yep, a flat, matte or satin white finish on the inside would work perfectly. Make sure you sand down (rough up) the plastic and prime it well, and use a primer that will stick to plastic. If you don't, the paint won't adhere at all. It'll flake off just from you looking at it.

Quote Originally Posted by TheRisen
Instead of using mylar or foil tape or anything like that would simply painting the inside of the box white do just as good of a job?