How to Mix Plaster of Paris to the Right Consistency
Learn how to mix plaster of Paris to the right consistency using a simple 1:2 ratio method from a professional plasterer with over 37 years of experience.
This step-by-step guide shows the correct plaster of Paris mix ratio, mixing process, and timing so it doesn’t set too fast, go lumpy, or fail during use.
Perfect for small repairs, filling mitres, plaster molds, and plaster casting.
What you’ll learn:
The correct plaster of Paris ratio (1:2 mix)
Why water ALWAYS goes in first
How long to let plaster soak before mixing
How to tell when plaster starts to set
How to get the right consistency every time
Tips to avoid lumps and fast setting
Materials used in this video:
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Important tips:
Never use hot water
Old plaster sets faster and can go lumpy
Do not overmix (this speeds up setting time)
Working time is typically 10–15 minutes
This plaster of Paris mix is commonly used for:
Small wall repairs
Filling mitres and joints
Decorative plaster work
Small plaster mold making
Chapters:
0:00 How to Mix Plaster of Paris (Intro)
0:10 What You Need
0:24 Water First (Important Step)
0:44 Plaster of Paris Ratio (1:2 Mix)
1:37 Let It Soak (Do Not Stir Yet)
1:54 Mixing Tips (Avoid Lumps and Fast Setting)
2:19 Final Consistency (What You Want)
2:29 What This Mix Is Used For (Repairs, Mitres & Molds)
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I’m Andy — a third-generation plasterer from England, now based in Canada. This channel focuses on real, traditional plastering - 🔔 Subscribe for more plastering tips, projects, and plaster decorations.
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