This article explains what Earthaus Primer Grit is and how to use it. It is a summary of the official Earthaus Primer Grit Product Guide, adapted for clarity and ease of reference. To view the full document, see the Earthaus Primer Grit Product Guide (PDF).
What Is Primer Grit?
Earthaus Primer Grit is a fine-grained pumice aggregate formulated as an additive for interior water-based latex primer. It is applied over level-4 finished drywall or previously painted walls before plaster application to improve adhesion.
Which Finishes Use Primer Grit?
Recommended for interior Earthaus finishes:
Not for use:
Limewash Finish
Tadelakt Finish (Shower)
Lime Stucco (Fine or Coarse)
Lime Slurry: most Lime Slurry applications are over porous masonry and use no primer at all — but in the rare case Lime Slurry is applied over a primed surface (drywall or painted walls), add Primer Grit to the primer.
Packaging & Coverage
One 3 lb package contains 5 cups of Primer Grit.
Mixing ratio: 1 cup Primer Grit per 1 gallon of primer.
One full package (5 cups) mixes into 5 gallons of primer.
Properties
Free-flowing granular powder.
Increases adhesion of plaster.
Suitable Primer Brands
Earthaus does not manufacture primer. Choose primers with zero to low VOCs. Examples:
Home Depot: PPG White Interior General Purpose Primer Zero VOC; Zinsser Bulls Eye Zero
Lowes: KILZ 3 Interior/Exterior Multi-purpose; Valspar Interior Multi-Purpose
Benjamin Moore: ECO SPEC® WB - N372; Sure Seal Latex Primer Sealer
Sherwin Williams: ProMar® 200 Zero VOC Interior Latex Primer; Multi-Purpose Latex Primer/Sealer
Storage
Unused Primer Grit stores indefinitely if kept dry.
This article reflects current Earthaus usage guidance for Primer Grit.
Still Have Questions?
Email support@earthausplaster.com or text 1-800-917-2414.