Waterproofing Wax for Leather vs (2 pack) Scotchgard Outdoor Water Shield, 10.5 oz, 1 Can: 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 Volatile organic compounds (VOCs) and aerosol inhalation, Skin and eye irritation from direct contact, Dermal absorption from treated textiles and PFAS presence and bioaccumulation (graded separately) on the Scotchgard and not on the Nikwax.
• The Nikwax is wax-based waterproofing where the Scotchgard is Proprietary water-repellent coating (composition undisclosed), 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.