Waterproofing Wax for Leather vs 3M Scotchgard Heavy Duty Water Shield: 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 inhalation exposure during application, Dermal and respiratory irritation from coating components, Coating durability and product replacement frequency and Contamination of treated fabric and household surfaces 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.