Paint shows every dent and ridge underneath it, which is why National Paints puts two coats of filler in its interior wall system. Short answer: National Stucco Filler is a ready-to-use, water-based PVA copolymer putty for interior concrete, plaster, masonry and wood. Apply it with a putty knife, about 100 microns per coat, and allow 6 to 8 hours between coats. This guide follows National Paints’ technical data sheet.
Key facts
| Type | PVA copolymer, homogenous smooth putty with antifungal and antibacterial additives |
| Use | Interior concrete, plaster, masonry and wood |
| Finish / colour | Smooth matt, white |
| Volume solids | 60 ± 2% |
| Spreading rate | 6 m² per litre (theoretical) |
| Film per coat | 100 microns dry, 165 microns wet |
| Drying at 30°C | Touch dry 1 to 2 hours; recoat 6 to 8 hours |
| Application | Putty knife; ready for use |
| Clean-up | Water |
| Shelf life | 18 months, sealed |
Where it fits in the system
- One coat of National PVA Primer Sealer for Masonry or PVA Primer White. National Acrylic Primer (W.B.) is another option in the specifier.
- Two coats of Stucco Filler.
- Two coats of emulsion, such as Eggshell Emulsion (Matt).
National also lists Stucco Filler under enamel systems for walls and for wooden doors and frames. See the interior wall system and our guide to painting an interior wooden door.
Applying it
- Make sure the primer is dry and the surface is clean.
- Spread a thin, even coat with a putty knife, working across the wall.
- Wait 6 to 8 hours at 30°C, then apply the second coat.
- Once dry, sand lightly and dust off before painting. The data sheet does not specify sanding, so follow your painter’s practice and the project specification.
How much to buy
| Wall area | Two coats at 6 m²/L |
|---|---|
| 30 m² | 10 L |
| 60 m² | 20 L |
| 150 m² | 50 L |
Frequently asked questions
Can I use it outside?
National lists it for interior surfaces. For exterior filling, see our guide to filling exterior wall cracks.
Does it need thinning?
No. The data sheet lists it as ready for use. Clean tools with water.
Which National filler?
| Product | Job |
|---|---|
| Stucco Filler | Skim the whole interior wall smooth before emulsion |
| Joint Filler | Cracks and joints |
| Block Filler | Seal open blockwork |
| N.C. Putty | Glazing on wood and steel, not walls |
Step 1: prepare the wall
- Clean, dry and sound, per National’s surface preparation guide. Remove laitance, efflorescence and loose material.
- Prime first. National’s interior system puts a primer such as Acrylic Primer (W.B.) or PVA Primer Sealer under the filler.
- Fill deep cracks with Joint Filler before skimming.
What the numbers mean
Coverage = 60 × 10 ÷ 100 = 6 m² per litre. Wet film = 100 ÷ 0.60 ≈ 167 microns, matching the sheet’s 165. Skims are rarely even, so real use is often higher on rough walls.
| Job (2 coats) | Litres at 6 m²/L |
|---|---|
| Bedroom walls, about 45 m² | about 15 L |
| Two-bed flat, about 200 m² | about 67 L |
Mistakes to avoid
- Using it outside. The sheet lists interior use.
- Second coat too soon. Wait 6 to 8 hours at 30°C.
- Painting unsanded filler. Sand and dust off before the emulsion.
Buy National Stucco Filler in Sharjah and Dubai
Al Tashteb Al Saree is an authorised National Paints retailer. Message us on WhatsApp for Stucco Filler, or shop the matching Eggshell Emulsion Matt.
Sources
- National Stucco Filler data sheet (PDF, via AEC Online)
- National Paints: Paint Systems Specifier (PDF)
- National Paints surface preparation guide, Sec. A-2 (PDF)
Retrieved 3 November 2026. Quantities are our own calculations. The main image is illustrative.
