Earthaus Plaster

Prep, substrates, tools, troubleshooting, and long-term care across all Earthaus finishes.

Application & Care

Yes — Earthaus plasters can be applied with a drywall pan and knife instead of a traditional hawk and trowel.

Can I use a drywall pan and knife to apply Earthaus Plasters?

Earthaus lime plasters perform well in high-heat areas like fireplace surrounds, as long as the substrate is stable and not exposed to direct flame.

Can I apply Earthaus Plasters in areas exposed to high heat?

Mixed Earthaus plaster stays workable for up to two weeks when stored sealed at room temperature (50–70°F).

How long do Earthaus plasters last once mixed?

Most Earthaus finishes in dry areas can be painted with proper prep — but Tadelakt in wet areas can never be painted.

Can I paint over Earthaus Plaster finishes?

Plaster cracks come from substrate movement or application technique — the crack pattern tells you which, and most are cosmetic.

What causes plaster to crack?

A symptom-by-symptom guide to diagnosing and fixing the most common Earthaus plaster application problems.

Troubleshooting: Common Application Problems

How to clean, maintain, repair, and reseal Earthaus plaster finishes — and the cleaners that should never touch them.

How Do I Care for and Maintain My Plaster Walls?

A finish-by-finish breakdown of the tools needed for Earthaus plaster projects — most are standard plastering and drywall tools.

What Tools Do I Need for My Plaster Project?

Dry plasters last up to 12 months in original packaging and most liquid products last 2 years when stored properly — keep dry products dry and never let acrylic sealers…

How Do I Store Earthaus Products? (Shelf Life & Storage)

All Earthaus plaster finishes are suitable for fireplace surrounds — here's how heat, substrates, and finish choice come together.

Can I Plaster My Fireplace? Finishes, Heat & What's Possible

What to do when you've added too much water to PHL Binder or a bagged Earthaus plaster — and what never to add.

My Mix Is Too Runny — Can I Save an Overwatered Batch?

Mixing, drying, cracking, painting over, tools, storage, and care.

General Plaster FAQ

Use any zero- or low-VOC interior PVA or latex primer beneath Earthaus plasters — always with Primer Grit mixed in.

What type of Primer should I use?

Primer Grit creates the mechanical bond Earthaus plasters need — use it on all non-wet-area substrates before plastering.

Do I need to use Primer Grit?

Earthaus plasters work over painted textured drywall with the right prep — fresh primer with Primer Grit and texture leveling.

Can I apply Earthaus Plasters over previously painted textured drywall?

Earthaus plasters can go over sound, clean, properly primed lath and plaster — but thin finish coats won't hide existing flaws.

Can I apply Earthaus Plasters over old lath and plaster walls?

Plywood works as a plaster substrate when joints are reinforced and tannins are sealed with stain-blocking primer plus Primer Grit.

Can I Apply Earthaus Plaster to Plywood?

Cement backer board and MgO board take Earthaus plaster well once finished to Level 4 and primed with Primer Grit.

Can I apply Earthaus Plaster to Cement Board or Mag Board?

Drywall is the most common substrate for Earthaus plasters — finish to Level 4 and prime with latex primer mixed with Primer Grit.

Can I Apply Earthaus Plaster Over Drywall (Sheetrock)?

Yes — always use Bond Plaster over wood-fiber boards like Steico, TimberHP, or Hempitecture Plant Panel, with an adhesion test first.

Can I Plaster Over Wood-Fiber Insulation Board?

In dry areas, yes — using Bond Plaster first. In showers and wet areas, never: the tile must be removed and a proper substrate built.

Can I Apply Earthaus Plaster Over Existing Tile?

Which surfaces plaster can go over, and how to prep them.

Substrates & Primers

Find answers and get help from Intercom Support and Community Experts

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