Waterproofing Wax for Leather vs Nubuck & Suede Waterproofing 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 Nikwax.
• We flag Volatile organic compounds (VOCs) / inhalation risk during application, Skin and eye irritation from direct contact, Incomplete disclosure of active and inert ingredients and Propellant identity and environmental/health profile on the Nikwax and not on the Nikwax.
• The Nikwax is wax-based waterproofing where the Nikwax is Silicone-based waterproofing treatment (composition undisclosed), which is most of the difference in these two grades.
• These two are level, close enough that price and fit should decide it rather than our grade.
• We are less certain about the Nikwax grade, at 45% confidence against 78%, because it discloses less.