Prepping Surfaces: Drywall, Blueboard and Surfaces Prepared with Unsealed Joint Compound
If the seams are already mudded, apply an undercoat of American Clay
Sanded Primer, to all unsealed mudded surfaces (including fastener patches),
let it dry, then undercoat the entire wall surface with American Clay Sanded
Primer. when the undercoat is dry, apply the plaster according to “Apply
American Clay Earth Plaster”.
TAPING AND MUDDING JOINTS
Drywall or blueboard seams must be mudded. You can tape and mud
with standard drywall compound or with natural joint compound.
Notes:
• Fasteners do not need to be mudded.
• Joint compound and plaster mudding does not need to be sanded.
• Ridges and protrusions in the mudding compound up to 1/16" and
depressions up to 1/16" are acceptable.
Mudding with standard joint compound.
1. Perform General Preparation steps above, as appropriate.
2. Mud the joints with standard joint compound and reinforce them with joint
tape (jute, paper or fiberglass scrim), filling the seam depressions level with
the surrounding surface.
3. Let joint compound dry completely.
4. Pre-prime only the mudded seams with American Clay Sanded Primer (see
directions below) and let this undercoat dry.
5. Apply a second coat of American Clay Sanded Primer–this time to the
entire wall surface.
6. Let the undercoat dry.
7. Mix and apply the plaster following the instructions below.
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