Waterproofer Spray vs Waterproofing Wax for Leather: which is safer?

Where these two actually differ

• We flag PFAS in waterproofing chemistry, Volatile organic compounds (VOCs) and propellant inhalation, Dermal irritation or sensitization from undisclosed ingredients and Coating degradation and reapplication frequency on the Skechers and not on the Nikwax.
• We flag Respiratory irritation or fume inhalation during application and PFAS in water repellency treatment on the Nikwax and not on the Skechers.
• The Skechers is Proprietary waterproofing spray coating where the Nikwax is wax-based waterproofing, 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 Skechers grade, at 35% confidence against 78%, because it discloses less.