Plaster

Plaster is for cement-based and traditional plastering projects where a smooth or durable surface is the goal.

You’ll find guides on surface prep, bonding, scratch/brown/finish coats, patching, corner details, sanding and finishing, and how to avoid common issues like cracking, poor adhesion, and uneven texture.

If your project is “make this wall look right again,” this is the category to start with.

Hand applying plaster to wall with a trowel

Patching Plaster After Plumbing Access Holes: How to Keep the Patch from “Drumming”

Introduction Patching plaster after plumbing access holes means rebuilding the damaged wall so it won’t drum when you tap it. Start by carefully removing loose plaster around the hole and cleaning the edge so the patch bonds well. Check the backing and, if needed, install a thin scrim or patching plaster to create a solid […]

Patching Plaster After Plumbing Access Holes: How to Keep the Patch from “Drumming” Read More »

Decorative plaster corbel on exposed brick wall

Rebuilding Decorative Plaster Edges: Simple Molds You Can Make to Match Profiles

Introduction Rebuilding decorative plaster edges means making simple, handmade molds to reproduce the profile you want. You can shape the mold from clay or use basic flexible material to match the original edge, then set it up for casting. Check the profile on the piece and follow manufacturer instructions or local rules for materials and

Rebuilding Decorative Plaster Edges: Simple Molds You Can Make to Match Profiles Read More »

Man applying plaster to interior wall with trowel

Plaster Repairs in High Humidity Rooms: How to Prevent Powdery Finishes

Introduction Plaster repairs in high humidity rooms require moisture-aware prep and material choices to stop powdery finishes. Start by preparing the walls carefully, removing loose material and cleaning the surface before patching. Choose materials and patching methods suited for humid conditions, and verify any limits on use with the product label or manufacturer instructions. Mix

Plaster Repairs in High Humidity Rooms: How to Prevent Powdery Finishes Read More »

Two plaster trowels leaning against rough plastered wall

Fixing Plaster at Baseboards: Rebuilding the Bottom Edge Without Removing All Trim

Introduction This is fixing plaster at the baseboard by rebuilding the bottom edge while leaving the trim in place. It’s a hands-on repair that tightens up gaps and brittle edges along the wall line. Plan to clean, assess damage, and mix materials that suit your wall type and existing plaster. You’ll need to protect the

Fixing Plaster at Baseboards: Rebuilding the Bottom Edge Without Removing All Trim Read More »

Hands in gloves applying plaster with a flat trowel

Lime Vs Gypsum Patching: Why Mismatched Materials Cause Future Failure

Introduction Mismatched patching materials can fail later due to incompatible chemistry. Lime and gypsum set and breathe differently, so using the wrong combo can lead to cracks, dusting, or damp spots. Stick to a patching mix that matches what’s already on the wall for best results. When patching, verify that the material is compatible with

Lime Vs Gypsum Patching: Why Mismatched Materials Cause Future Failure Read More »

Worker applying plaster to wall with trowel and hawk

Plaster and Vapor: Where Breathability Matters in Older Walls

Introduction Breathable plaster and finishes are materials that allow moisture to move through walls while still providing a solid, decorative surface. In practical DIY terms, that means choosing coatings that don’t seal the wall airtight, so old walls can dry out after moisture events. This matters most on older homes with lime or clay components

Plaster and Vapor: Where Breathability Matters in Older Walls Read More »

Woman in dress cleaning white plaster wall near floor

Stains Bleeding Through Plaster: How to Block and Seal Before Repainting

Introduction Stains bleeding through plaster are stains that show up after painting because the stain is seeping through the surface. Common culprits include water marks, tannins from wood, or mildew, and they can push color through even a fresh coat. Before painting, plan to seal and block the stains with the right primer or sealant,

Stains Bleeding Through Plaster: How to Block and Seal Before Repainting Read More »

Hand sanding a plastered wall with sanding sponge

Sanding vs Polishing Plaster: Time-Consuming Steps & Duration Comparison

Introduction The time it takes to sand or polish plaster can vary greatly depending on the surface area, condition, and your chosen method. Before you start, understanding the timeline for each process will help you plan effectively. In this guide, we’ll compare the duration of sanding vs polishing plaster, breaking down each step’s time commitment

Sanding vs Polishing Plaster: Time-Consuming Steps & Duration Comparison Read More »

Close-up of plaster being mixed in a large bucket

Mixing Plaster Without Lumps: Water-First Vs Plaster-First and What Changes

Introduction Water-first and plaster-first are two simple ways to mix plaster without lumps. With water-first, you add water to the bowl first, then sift plaster into it and stir. With plaster-first, you dump dry plaster into the water and mix until it smooths. Both methods affect how fast you get a smooth mix and how

Mixing Plaster Without Lumps: Water-First Vs Plaster-First and What Changes Read More »