Render is a cement-based coat applied to exterior masonry to level and weatherproof it. Plaster is the equivalent internal levelling coat, usually gypsum or cement based. Putty is a thin, fine skim applied over plaster to create a smooth, sealed surface ready for paint.
Thickness and order
Render is applied 10–20 mm thick, plaster 6–15 mm, and putty typically 0.5–2 mm across one or two passes. They stack in that order: structure, render or plaster, putty, primer, finish.
Choosing the right putty
Interior putties prioritise sanding ease and whiteness. Exterior putties must be water resistant and cement based, because gypsum-based products break down under wetting cycles.
For skim coats over concrete or precast panels, a polymer-modified putty with strong adhesion is preferred over generic wall putty.
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Reviewed by
Sabbir Ahmed
Applications & Training Manager
Terraco-certified applicator trainer, 15 years site experience
See our technical advisory panelStandards referenced
- —EN 1504-10: Site application of products and quality control
- —Terraco technical datasheets and application manuals
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