Hey Jeremy, Mike Lawrence turned me onto white zone marking paint. They use it for painting parking lots and roads. I got some at Ferrel Calhoun for cheap & it works great, just make sure it is well shakin'.
Go to Hot Springs on airport road and go to Benjamin Moore paint Store. Ask for the Gemini field trial paint. I wouldn't fool with Sherwin Williams paint.
Sherman Williams is the only way to go. I can run in a 2 day and never have to touch dogs paint up at all. Was using gemini and it's about like water and numbers would look dull after 1 day of running.