Building & renovation
How much bonding primer for walls?
How much bonding primer for weak or dusty walls — liters from area and coverage per coat.
Quick answer
Bonding primers consolidate dusty render, gypsum skim coats and weak old paint so the finish coat does not peel. One full coat is standard at roughly 8–10 m²/L — similar to interior emulsion but applied thinner and worked into the surface. Worked example: 80 m² facade prep, 9 m²/L, 10% waste → 80÷9×1.1 ≈ **9.8 L** → **4× 2.5 L cans**.
Advanced settings
Paint needed
4.9 liters
- Cans to buy
- 2 × 2.5 L
Bonding primers bridge weak or dusty surfaces — one full coat before finish paint. Yield is similar to interior emulsion on prepared walls (~8–10 m²/L).
How it works
Use when the wall rubs chalk on your hand or when new plaster is too smooth for direct finish. Not the same as fixative (suction control) or anti-mould sealer — match product to the failure mode. bonding primer masonry before your topcoat system.
Frequently asked questions
Bonding primer vs fixative — which first?+
Fixative evens suction on uniform absorbent plaster — often one thin coat. Bonding primer is for weak, dusty or incompatible surfaces that need mechanical grip. Some renovation jobs need fixative then finish; others need bonding primer only. Read the substrate, not a generic blog order.
How much for 50 m² of chalky walls?+
One coat at 9 m²/L: 50÷9 ≈ 5.6 L → three 2.5 L cans with waste. Chalky surfaces may drink product — use the absorbent surface factor in the calculator (+30%).
Can I roll bonding primer?+
Yes — short-nap roller or brush, worked well into the surface. Spray is rare on residential jobs. Do not dilute beyond the label; weak primer defeats the purpose.
How long before finish paint?+
Typically 4–24 h depending on product and temperature — full cure before heavy finish coats. Recoat outside the window and adhesion fails silently months later.
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