Waterproofing Wax for Leather vs Good Stuff Vinyl, Rubber & Leather Protectant, 18 oz, Leather Scent, 12/Case: 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 Zep.
• We flag Volatile Organic Compounds (VOCs) and inhalation risk, Fluorocarbon water-repellents (PFAS) uncertainty, Skin and eye contact irritation and Coating buildup and residue on surfaces on the Zep and not on the Nikwax.
• The Nikwax is wax-based waterproofing where the Zep is proprietary protectant blend, unspecified active ingredients, which is most of the difference in these two grades.
• We are less certain about the Zep grade, at 25% confidence against 78%, because it discloses less.