We wear leather because it breathes and we stay comfortable. Never seal it off unless absolutely necessary! When pores are sealed the leather cannot breathe and you'll sweat like wearing rubber. Sealed leather is uncomfortable, stinks, and body acids, bacteria, and salt rot it from the inside out. Try wrapping your arm in cellophane wrap for a few hours to get a better understanding of what "sealing" your leather goods does to them, or imagine painting pine pitch or tar on your skin and sealing off the pores in this fashion. You can repel water easily and longer, resist chemicals, stay comfortable, and extend the useful life of your leather without sealing the pores. Simply extend the tanning process by regularly restoring the leather with proper natural oils.