Waterproofing Wax for Leather vs Water Proofer: which is safer?

Where these two actually differ

• We flag Respiratory irritation or fume inhalation during application and PFAS in water repellency treatment on the Nikwax and not on the Sof Sole.
• We flag PFAS in waterproofing chemistry, Volatile organic compounds (VOCs) from solvent carriers, Coating degradation and microplastic shedding and Inhalation exposure during application on the Sof Sole and not on the Nikwax.
• The Nikwax is wax-based waterproofing where the Sof Sole is Waterproofing spray coating, composition unspecified, which is most of the difference in these two grades.
• The gap is 25 points, wide enough that this is not a close call, and the Nikwax is the one to buy.
• We are less certain about the Sof Sole grade, at 35% confidence against 78%, because it discloses less.