Waterproofing Wax for Leather vs Indoor/Outdoor Fabric Guard: which is safer?
Nikwax Waterproofing Wax for Leather is our pick: better on PFAS and on the overall hazard picture.
Our pick
Nikwax
Waterproofing Wax for Leather
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleRespiratory irritation or fume inhalation during application
ReportedPFAS in water repellency treatment
Williams Sonoma
Indoor/Outdoor Fabric Guard
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
LikelyPFAS in waterproof coating
PossibleVolatile organic compounds (VOCs) during application
PossibleRespiratory or skin sensitization from fragrance or solvent
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 Williams Sonoma.
- We flag PFAS in waterproof coating, Volatile organic compounds (VOCs) during application, Respiratory or skin sensitization from fragrance or solvent and Coating degradation and redeposition of microparticles on the Williams Sonoma and not on the Nikwax.
- The Nikwax is wax-based waterproofing where the Williams Sonoma is Fabric treatment/waterproof coating, unspecified chemistry, 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 Williams Sonoma grade, at 35% confidence against 78%, because it discloses less.
Both products run through the same public rubric: materials, coatings, brand disclosure, lab findings, and recalls, plus a beyond-PFAS hazard analysis. Grades are model-based estimates, not lab tests. How grades work →
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