Is Sherwin-Williams ProBlock 100 Oil-Modified Low VOC Primer toxic?
No paint is risk-free, and "toxic" depends on how much you're exposed to and for how long. Here is what Sherwin-Williams's own documents show. Sherwin-Williams ProBlock 100 Oil-Modified Low VOC Primer scores 40 out of 100. Its untinted VOC is 75 g/L. Its Safety Data Sheet lists no cancer, reproductive, genetic, allergen or organ warnings. We found no third-party emissions testing for it.
- Health score
- 40
- VOC g/L
- 75
- Use
- Interior primer
Safety Data Sheet warnings
- Cancer warning (dust only)Listed ingredients are hazards as inhaled dust. Wear a mask when sanding or spraying.
Evidence beyond the label
- Emissions testing: none found
- Health certification: none found
- Full ingredient list (Health Product Declaration): not published
Product
Updated October 12, 2026. Scores summarize the evidence makers publish. They don't guarantee safety or predict individual health outcomes. No brand pays to be listed. How we score