[RoadieFan]

or use a staple gun, drive the staples through the edge of the sign all the way around, leaving the points sticking straight out.

I do like the poison ivy juice idea.

[gunsequalfreedom]

or use a staple gun, drive the staples through the edge of the sign all the way around, leaving the points sticking straight out.

Yep, that is a good way also. Actually easier and those staple points hurt also when you grab a palm full of them.