Substrate/Primer FAQ

What type of Primer should I use?

Please Refer to our Primer Grit Product Guide for a list of Suitable Primers.

Do I need to use Primer Grit ?

Earthaus Primer Grit serves to create a mechanical bond for the adhesion of the plaster finish. Primer Grit also creates a more favorable surface on which to apply plaster. Primer Grit is recommended for all Earthaus Plaster applications in non-wet

Can I apply Earthaus Plasters over previously painted textured drywall?

Yes. Due to the variable nature of previously painted walls, we always recommend a fresh coat of primer with our Primer Grit added to create an even substrate ready for plaster. Many previously painted walls are also textured. Depending on the dep

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

Yes. Keep in mind that Earthaus Plaster finishes are applied very thin and will not cover structural or cosmetic flaws in old plaster walls. These areas will need to be repaired and primed before application of Earthaus Plasters.

Can I Apply Earthaus Plaster to Plywood?

Yes, however, careful surface preparation is essential to avoid issues that can compromise both the aesthetic and performance of the final Earthaus Plaster Finish. There are two main concerns to address: joint cracking and tannin bleed-through. Joint

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

When applying Earthaus Plasters to cement backer board (such as HardieBacker or Durock) or magnesium oxide (MgO) board, proper surface preparation is important. The board must be finished to a level 4 drywall standard using normal drywall finishing t