Mylar for free
I use to use the back side of Cystal-Craze background material for
reflective material, using left over stripes from backgrounds. Then one day
while finishing off a bag of Lays potato chips, I noticed the shinny inside
of the bag! WHy not? I cut the bag and cleaned the silver side with "Simpe
Green" and washed off with water. I'm sure there are better mylars but you
can't beat the price. I don't expose the stuff to water as I have glass
tops. It won't last for ever but either does a bag of potato chips.