Waterproofing Wax for Leather vs Starter Kit: 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 Shoe MGK.
• We flag Volatile organic compounds (VOCs) / solvent off-gassing, Formaldehyde or formaldehyde releasers in preservatives, Contact dermatitis from undisclosed fragrance or resin allergens and Microplastic contamination in wax or polish formulations on the Shoe MGK and not on the Nikwax.
• The Nikwax is wax-based waterproofing where the Shoe MGK is Unknown, appears to be shoe care kit components, which is most of the difference in these two grades.
• We are less certain about the Shoe MGK grade, at 25% confidence against 78%, because it discloses less.