Is Sherwin-Williams ProBlock Interior Oil-Based 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 Interior Oil-Based Primer scores 14 out of 100. Its untinted VOC is 522 g/L. Its Safety Data Sheet carries these warnings: reproductive warning and organ toxicity warning. We found no third-party emissions testing for it.
- Health score
- 14
- VOC g/L
- 522
- Use
- Interior primer
Safety Data Sheet warnings
- Reproductive warningSuspected of damaging fertility or the unborn child.
- Organ toxicity warningMay affect organs through repeated or high exposure (for example solvent vapors).
- Cancer warning (dust only)Listed ingredients are hazards as inhaled dust. Wear a mask when sanding or spraying.
- 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