Yes, hdlp. or Montana Pitch Blend or Sno-seal or anything that has beeswax. Heating leather by putting it in the sun will get it to about 120, maybe 130 degrees F. Not crazy. If the leather is cracked, it's not going to become un-cracked. But doing what I said will open the pores - even in the cracks - and will keep the boot serviceable.For God's sakes, these are BOOTS.