Domakihub How to Plaster a Wall: A Step-by-Step Guide
Everything you need to know before mixing your first batch — from surface prep to a smooth finish.
Reviewed by Domakihub home & decor pros · 2026-06-23 · 5 min read
Plastering looks deceptively simple, but getting a flat, crack-free wall takes the right materials, correct timing, and a feel for the plaster that only comes with practice. The video above walks through the full process in real time, while this guide breaks it down into clear, repeatable steps — written for anyone renovating a home, holiday rental, or hotel room in Greece. Whether you are re-coating a room after damp repair or finishing a new partition wall, understanding what each stage demands will help you either do it well yourself or brief a plasterer properly.
When a Pro or Permit Is Required
Plastering a standard interior wall for cosmetic or repair purposes is a DIY-legal task in Greece that requires no building permit. However, if the wall has active rising damp or penetrating moisture, you must resolve the source before replastering — using a specialist damp-proofing render is a job best left to a certified waterproofing contractor, because wrong materials trap moisture and cause structural damage over time.
Any work touching load-bearing masonry, structural cracks wider than 2 mm that keep reopening, or walls adjacent to gas lines or electrical panels should be assessed by a licensed civil or structural engineer (Πολιτικός Μηχανικός) before any rendering work begins. A hairline surface crack, by contrast, is cosmetic and safe to repair yourself.
Materials and Tools You Will Need
For a standard skim coat or two-coat plaster job you will need: bonding agent (PVA or acrylic primer), gypsum finish plaster or cement-based render depending on the substrate, a bucket, a mixing paddle or drill attachment, a plasterer's hawk, a steel finishing trowel (inox recommended for Greek humidity), a scratch tool or devil float, and a damp sponge. For rough or old masonry walls in Greece, a cement-sand base coat (1:4 ratio) is applied first; modern drylining or plasterboard walls take a single gypsum skim coat.
Buy slightly more plaster than you think you need. Gypsum plaster sold in Greece typically sets in 45–90 minutes depending on the brand and ambient temperature — in summer, working time shortens noticeably, so mix smaller batches and keep tools clean.
How to Plaster a Wall: 5 Steps
- 1
Prepare the Surface
Remove loose paint, old flaking plaster, dust, and grease. Fill any deep holes or voids with a base render or filler and let them cure fully. Lightly dampen very absorbent brick or blockwork with water so it does not pull moisture from the new plaster too fast. Apply a bonding coat of diluted PVA (roughly 1 part PVA to 5 parts water) and let it become tacky but not fully dry — this creates a mechanical key for the plaster to grip.
- 2
Mix the Plaster
Add plaster to clean, cold water — never the other way around — and mix until the consistency resembles thick yogurt with no lumps. Use a clean bucket for every batch; plaster residue dramatically shortens set time. In hot Greek summers, chill the water slightly to extend working time. Mix only as much as you can apply in 30–40 minutes.
- 3
Apply the First Coat
Scoop plaster onto your hawk and apply it to the wall with firm, upward strokes using the steel trowel, working in sections of roughly 1 square metre. Aim for a thickness of 8–12 mm for a base coat, or 2–3 mm for a skim coat over plasterboard. Use a straight edge or feather board to check for flatness and fill any hollows immediately while the plaster is still open. Scratch the surface lightly with a scratch tool once it firms up if a second coat will follow.
- 4
Apply the Finish Coat and Trowel Up
Once the first coat has reached a leathery firmness (it should not indent when pressed firmly but will still feel slightly cool), apply a thin finish coat of 2–3 mm. As the plaster starts to stiffen — typically 20–40 minutes after application — dampen your trowel slightly and use tight, flat strokes with increasing pressure to close the surface and bring up a smooth finish. The trowel should glide; if it drags, the plaster is too dry. Work in overlapping passes, finishing in long vertical strokes.
- 5
Cure and Protect
Do not apply heat, force ventilation, or direct sunlight immediately after finishing — plaster needs to cure slowly. Keep windows partially open but avoid draughts for the first 24 hours. Leave the surface to dry completely before decorating: gypsum skim typically needs 3–7 days depending on the room's humidity; cement render may need 28 days before painting. Prime with a diluted mist coat (10% water in emulsion) before applying a full finish paint coat so the paint does not peel.
Rather have a pro handle it?
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FAQ
- Can I plaster directly over painted walls?
- It depends on the paint condition. A sound, matt-finish painted wall can be keyed by sanding and then primed with bonding agent. Gloss paint, however, must be stripped or thoroughly abraded because plaster will not adhere reliably. Old walls with multiple layers of flaking paint should be stripped back to bare substrate for a lasting result.
- How long should I wait before painting over new plaster in Greece?
- At least 3–7 days for gypsum finish plaster, and up to 28 days for cement render — longer in humid coastal areas or if the room is enclosed. The plaster should be uniformly pale in colour with no dark patches before you paint. Apply a diluted mist coat first; this seals the surface without blocking the remaining moisture from escaping.
- What is the difference between plastering and rendering?
- In practice the terms overlap, but rendering usually refers to cement- or lime-based coats applied to exterior walls or rough masonry to provide a weatherproof base. Plastering typically refers to gypsum-based finish coats applied to interior walls for a smooth decorative surface. In Greece, exterior facades are most commonly rendered with cement-sand mortars, while interior rooms are finished with gypsum skim.