Waterproofing Wax for Leather vs UV/H20 Protectant: 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 Tuff Stuff.
• We flag Volatile organic compounds (VOCs) and off-gassing, Fluorocarbon chemistry and inhalation risk (water repellent component), Skin and eye irritation from direct contact or overspray and Chemical residue accumulation on fabric with repeated application on the Tuff Stuff and not on the Nikwax.
• The Nikwax is wax-based waterproofing where the Tuff Stuff is proprietary UV and water protectant spray 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 Tuff Stuff grade, at 35% confidence against 78%, because it discloses less.