Waterproofing Wax for Leather vs Fabric & Upholstery Protector: 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 PFAS bioaccumulation and environmental persistence, Inhalation risk from spray application, Lack of ingredient transparency and traceability and Leaching into skin and household dust on the Scotchgard and not on the Nikwax.
• The Nikwax is wax-based waterproofing where the Scotchgard is Proprietary fabric protectant coating, unspecified fluorochemical base, 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.