Waterproofing Wax for Leather vs Outdoor Water Shield Fabric Protector Spray: 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 Scotchgard.
• We flag Spray inhalation of fluorochemical particles, Skin or eye contact during application, Environmental release of PFAS to soil and water and Volatilization of unreacted monomer or curing byproducts on the Scotchgard and not on the Nikwax.
• The Nikwax is wax-based waterproofing where the Scotchgard is Proprietary water and stain repellent coating, 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 Scotchgard grade, at 35% confidence against 78%, because it discloses less.