Waterproofing Wax for Leather vs 303 Marine 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 303 Products.
• We flag Volatile Organic Compounds (VOCs) / Solvent inhalation, Fluorine-based water repellents (beyond PFAS), Skin sensitization / Fragrance allergens and Coating degradation and reapplication frequency on the 303 Products and not on the Nikwax.
• The Nikwax is wax-based waterproofing where the 303 Products is fabric treatment spray, composition undisclosed, 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 Products grade, at 35% confidence against 78%, because it discloses less.