Thanks for your reply, @backstage! There are so many incredible, solid resources available for free, and as you say it's often doing a business a favor to haul off their "trash" to turn into treasure!
We have used outdoor paint on tires with success.
Great tip about using the tires filled with sand, we didn't even touch on using them as reliable foundations for buildings but that's an excellent use of them as well. Love that sustainable living provides so many opportunities for health and exercise activation!!!
As we share, we have almost a decade's experience with no toxicity from growing in tires. The greens are very healthy specimens and taste fantastic!
Your support is greatly appreciated, @backstage!