I am making a sign out at my farm. I am making everything myself and have come up with an idea on getting the letters to stick to the front of the sign with magnets. I just have plastic letters with magnets glued to the back and they just stick on the front of the sign that has a galvanized metal sheet. (18 gauge). So they stick on the front of the sign no problem. Now what I am trying to do is get the letters to stick to the front of the sign with an electromagnet so the letters stick on and can not be stolen or re-arranged. The sign itself is oval and about 6 by 8 feet. So I need to some how make the face of the sign a large electromagnet. I am hoping to make one that will have a lifting force of say 50-100 lbs. Now with the face only being 18 gauge it is very thin and kinda impossible to wrap copper wire around it. So here is what I am thinking might work and will diffidently need some input before I start investing money into it. Here goes....what if I bend a 1 inch lip all around the face of the sign it self. So the sign will now have a face with a top,bottom and 2 sides all around it at 1 inch. Then I would use that lip and start to run copper around and around the sign. Hook both ends up to my power supply and I have a large electromagnet sign!!!!! I hope!! So if anyone is an expert in this field please I would love to hear from you. Let me know if I am on the right track or if I am out to lunch!