Lynnmor wrote:
My trailer always is parked at the exact same spot in my pole barn. The concrete floor had a sealer applied when new and now there are brown spots at each tire location. I believe that the preservative in the tires is slowly being absorbed by the concrete despite the sealer. I don't know if this has much of a negative effect on the tires, but my floor is getting uglier with each passing year.
My dually is parked on a non-sealed concrete pad for six months or more at a time, and I've noticed no discoloration of the concrete. It's possible the sealant is what is being discolored and not the concrete.