Any of the suggestions above will work, but one thing to consider, not many balls go out that far, but when the kids practice they generally use various parts of the whole field. Therefore, if a ball goes over the fence while practicing and a kid runs after it, on metal products they can hurt themselves quite badly and even on 10 mil Cor-X will hurt them if they appraoch wrong.
All the parks we do.... and we do alot of them, have chain-link fences. They have a rather large about 4" or 6" round capping going along the top of the fence to prevent kids [
or anybody] from falling or reaching over the fence from injury. The majority of them use carriage bolts with fender washers and then, some use zip ties. The zip ties are constantly being changed out. Almost all of them are .050 aluminum sheets, while some parks use banners and some still use 1/2" duraply. None of them use Cor-X. I won't let them.
The problem with Cor-X is, these little leagues need to pay for supplies and maintenance and most of that comes from sponsor signs. They generally sell these signs for a 2 or 3 year contract for say $500 or $600 for 3 years. So, if you sell them cheap Cor-X and say it does last a year, they'll have to come back next year and pay you again to make a sign, which takes away from their funding. I know many people here will say, it's business, but if it help these little kids stay off the streets and maybe not turn to drugs or gangs then it's worth it to give these organizations a good deal with a good product. Not only can they buy more
NEW signs by advertising the good deal and work you do, but they can prosper and they'll know you helped. Over the years, these little signs have brought in tons of work.
I love doing them. They're easy and very rewarding.
Think of the future in more than just one way.