Side-by-side comparison
Sherwin-WilliamsExtreme Block Interior/Exterior Stain Blocking Waterbased PrimerN/A · White63GoodReplace
Sherwin-Williams Drywall Conditioner N/A Clear vs Sherwin-Williams Extreme Block Interior/Exterior Stain Blocking Waterbased Primer N/A White
Sherwin-WilliamsExtreme Block Interior/Exterior Stain Blocking Waterbased PrimerN/A · White63GoodReplace| Fact | Drywall Conditioner | Extreme Block Interior/Exterior Stain Blocking Waterbased Primer |
|---|---|---|
| Use | Interior primer | Exterior primer, Interior primer |
| Sheen · base | N/A · Clear | N/A · White |
| VOC (untinted) | 92 g/L | 24 g/L |
| VOC added by tint | Not stated | Not stated |
| Emissions testing | Not documented | Tested (LEED emissions) |
| Health certification | None found | None found |
| Safety Data Sheet warnings | None | 2 |
| Ingredient disclosure | Partial (environmental data sheet) | Partial (environmental data sheet) |
| Safety Data Sheet revised | 8/14/2026 | 8/25/2026 |
Highlighted rows are where the two products differ. Facts come from each maker's documents; "not disclosed" means the maker hasn't published it, not that the product failed a test.
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Scores summarize the evidence makers publish. They don't guarantee safety or predict individual health outcomes. How we score
Sources
Sherwin-Williams Drywall Conditioner
Sherwin-Williams Extreme Block Interior/Exterior Stain Blocking Waterbased Primer