Is Sherwin-Williams ProBlock Quick Dry Oil-Based Interior 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 Quick Dry Oil-Based Interior Primer scores 8 out of 100. Its untinted VOC is 347 g/L. Its Safety Data Sheet carries these warnings: cancer warning, skin allergen and organ toxicity warning. We found no third-party emissions testing for it.
- Health score
- 8
- VOC g/L
- 347
- Use
- Interior primer
Safety Data Sheet warnings
- Cancer warningContains Ethylbenzene Ethylbenzene, Methyl Ethyl Ketoxime N-Butan-2-ylidenehydroxylamine, a suspected carcinogen present in the paint itself, not only as dust.
- Skin allergenMay cause an allergic reaction.
- Organ toxicity warningMay affect organs through repeated or high exposure (for example solvent vapors).
- FlammableKeep away from heat and flames.
- Aspiration hazardMay be fatal if swallowed and enters airways.
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