Lee, the 1/8" thickness might be a bit much. I'll know better when I get to use them. But I bet they won't move when I spray them!
One thing I'm not going to do (or at least I don't think I will) is deburr the backside of the letters. When I paint them I doubt it will make a difference. But, keeping the burr on the back side will make it easy for me to orientate them face up......burr side down means front side up.
I may not know what I'm doing, but I am having fun doing it wrong!!
Happy Day Veterans!!