Is Benjamin Moore Ultra Spec Masonry Int/Ext High Build Block Filler toxic?
No paint is risk-free, and "toxic" depends on how much you're exposed to and for how long. Here is what Benjamin Moore's own documents show. Benjamin Moore Ultra Spec Masonry Int/Ext High Build Block Filler scores 58 out of 100. Its untinted VOC is 50 g/L. Its Safety Data Sheet lists no cancer, reproductive, genetic, allergen or organ warnings. It documents third-party low-emissions testing.
- Health score
- 58
- VOC g/L
- 50
- Use
- Interior primer, Exterior 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: documented
- 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