Extreme Block Interior/Exterior Stain Blocking Waterbased Primer

N/A · White · Exterior primer63GoodLow emissions

Health score

63Good

Cancer warning (dust only)-3Listed ingredients are hazards as inhaled dust. Wear a mask when sanding or spraying.

Indoor air23 of 40 pointsFair

VOC level, VOC added by tint, emissions testing

Low VOC+824 g/L VOC in the untinted base, per the maker's environmental data sheet.

Tint VOC not disclosed0The maker does not state how much VOC colorants add when tinted.

Low emissions tested+15Maker states it meets the LEED v4 low-emitting materials standard.

Ingredient hazards32 of 35 pointsStrong

Warnings on the Safety Data Sheet

Cancer warning (dust only)-3Listed ingredients are hazards as inhaled dust. Wear a mask when sanding or spraying.

Transparency8 of 15 pointsFair

How fully the maker lists ingredients

Good disclosure+8Publishes an environmental data sheet with its full list of volatile ingredients.

Independent verification0 of 10 pointsWeak

Health certifications confirmed with the certifier

No ingredient certification0No independent ingredient or health certification found (for example Asthma & Allergy Friendly or Green Seal).

See the full score breakdown
Free. Answer 4 quick questions and create your account.

Scores summarize the evidence makers publish. They don't guarantee safety or predict individual health outcomes. How we score

Health scoreTop 29%Scores higher than 71% of 61 products

VOCLowerLower VOC than 70% of products

Same use and n/a sheen, higher score.

From the Safety Data Sheet, which names ingredients that carry a hazard classification.

Product number: B51W00100
Barcodes: 035777904350, 035777956236, 035777956250
Sizes: 1 Quart, 1 Gallon, 5 Gallon
VOC (untinted): 24 g/L
Hazard classes: Carcinogenicity cat 1b; Specific target organ toxicity (repeated exposure) cat 1
Safety Data Sheet: Revised 8/25/2026

See healthier options, rankings and ingredients
Free. Answer 4 quick questions and create your account.

Preliminary score, method v1.0. Product photo from the maker, shown for identification.