Waterproofing Wax for Leather vs Ultimate Fabric Guard: 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 Star brite.
• We flag Inhalation of spray aerosol and volatile organic compounds, Skin contact with undisclosed chemical coating, Fabric discoloration or damage from solvent base and Off-gassing and indoor air quality if applied indoors on the Star brite and not on the Nikwax.
• The Nikwax is wax-based waterproofing where the Star brite is proprietary water and stain repellent 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 Star brite grade, at 35% confidence against 78%, because it discloses less.