Waterproofing Wax for Leather vs Fabric and Upholstery 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 Respiratory exposure during application, Shedding into household dust and washwater, Lack of ingredient transparency and batch consistency and Chemical persistence in soft furnishings and repeated exposure routes on the Scotchgard and not on the Nikwax.
• The Nikwax is wax-based waterproofing where the Scotchgard is Proprietary fluorochemical-based stain and water 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.