303 Fabric Guard Fabric Protectant Spray vs Waterproofing Wax for Leather: which is safer?

Where these two actually differ

• We flag PFAS in water-repellent coating, Inhalation risk from spray application, Volatile organic compound (VOC) off-gassing and Coating durability and reapplication burden on the 303 Protectant and not on the Nikwax.
• We flag Respiratory irritation or fume inhalation during application and PFAS in water repellency treatment on the Nikwax and not on the 303 Protectant.
• The 303 Protectant is proprietary water and stain repellent coating where the Nikwax is wax-based waterproofing, 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 303 Protectant grade, at 45% confidence against 78%, because it discloses less.