(for example)I want to know what to put in between polarity N from one magnet and polarity south on another magnet so the magnetic force won‘t pull the magnets toward each other?
The surface cracks that occasionally appear have been called many things; Weather Checking, Weather Cracking or Ozone Cracking. These small cracks typically develop in the sidewalls or at the base of the tread grooves. Depending on their severity, they may be cosmetic in nature if they don't extend past the rubber's outer surface, or may be a reason to replace the tire if they reach deep into the rubber.
It sounds like to me the tires are beginning to dry rot. Tires begin to dry out once they are so old age wise, not mileage wise have been through the weathering process. For example my bike tires have 90% thread left on them, but are dry rotted, and therefore need replacing, even though they are still brand new pretty much thread wise. They may only have 100 miles, but it means the tires are old.
Lead brass copper cardboard anything Plastic Anything non Ferrous
not something can stop magentism. Magnetic fields bypass by using stars, planets and each little thing else. not being laid low with magnetism and preventing magnetism are 2 thoroughly dofferent issues.
A magnetic field will penetrate *any* material you put between two ends of a magnet, including lead, brass, copper, etc. The answer to your question is another magnet, with North facing North and South facing South. That way the two magnets are (essentially) repelling one another.
