Waterproofing Wax for Leather vs Waterproof Leather & Suede 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 Tarrago.
• We flag PFAS in waterproofing chemistry, Volatile organic compound (VOC) inhalation from solvents and propellants, Formaldehyde or formaldehyde releasers in resin binders and Skin and eye irritation from direct contact on the Tarrago and not on the Nikwax.
• The Nikwax is wax-based waterproofing where the Tarrago is Proprietary waterproof/stain-resist coating on leather/suede, 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 Tarrago grade, at 45% confidence against 78%, because it discloses less.