In our neck of the woods, local entrepreneurs have been known to steal the rugs off the backs of horses.
Prominent postcode markings might provide some deterrent as long as they are not easy to remove. It struck me that road / survey / site marking spray paint might do the job. Any suggestions? Horse rugs are often nylon, sometimes polyester, and may have silicone waterproofing. Also they get washed in industrial size washing machines every year. So we need something which won't wash out, otherwise it's a bit easy to defeat.
It needs to be a marking which stays visible from a distance to deter purchasers.
TIA