I assumed the manufacturers of the fencing would sell an optional sleeve to protect the power-coating on the posts from the repeated scraping of the trimmer cord, but they do not? Does anyone have any ideas? Is this even needed?
Get a piece of approprietly sized PVC pipe or corragated plastic drain pipe.For a 4 inch post use pipe with at least a 4 inch inside diameter Cut it into 6-9 inchs long pieces. Slice the pieces so you have 1/2 of a piece of pipe. Bury the pipe about 3-6 inches into the ground so it covers the base of the post. Fill the space between the pipe and the post with crushed stone.
I found these. I don't know how I found them or why I couldn't find them before.