Short answer: National Wood Primer is a high-opacity, alkyd-based primer for softwood, hardwood, plywood and chipboard, inside and out. It dries to a white matt film, covers about 14 to 18 m² per litre and recoats in 8 hours at 30°C. It is the first coat of National’s painted wood system: Wood Primer, Stucco Filler, Synthetic Undercoat, then Gloss I or Gloss II enamel.
Paint, stain or varnish?
| Wood Primer (painted system) | Wood Stain | Synthetic Varnish | |
|---|---|---|---|
| Look | Opaque colour; grain hidden | Coloured, grain visible | Clear, grain visible |
| Volume solids | 55% | 35% | 36% gloss, 43% matt |
| m² per litre | 14 to 18 | 14 to 17.5 | 12 to 14 gloss, 14 to 17 matt |
| Recoat (30°C) | 8 h | 6 to 8 h | 6 to 8 h |
Key facts
| Type | Alkyd-based wood primer, single pack |
| Surfaces | Softwood, hardwood, plywood, chipboard; interior and exterior |
| Finish and colour | Matt, white |
| Volume solids | 55 ± 2% |
| Spreading rate | 14 to 18 m² per litre (theoretical) |
| Film per coat | 30 to 40 microns dry (55 to 70 wet) |
| Drying at 30°C | Touch dry 2 to 3 hours; recoat 8 hours; hard dry 24 hours |
| Application | Brush, roller or spray (airless 2200 psi, tip 0.015 to 0.017 inch) |
| Thinning | 5 to 15% with National G.P. Thinner |
| Flash point | 38°C |
| Shelf life | 18 months, sealed |
Step 1: prepare the wood
National’s surface preparation guide sets out the order for new wood:
- Make sure the wood is dry.
- Rub down with glass paper and dust off.
- Treat knots with knotting, and apply wood preservative where needed.
- Prime.
Step 2: the system
| Coat | Product |
|---|---|
| 1 | Wood Primer |
| 2 and 3 | Stucco Filler × 2 |
| 4 | Synthetic Undercoat |
| 5 | Synthetic Enamel Gloss I or Gloss II |
What the numbers mean
Coverage = volume solids × 10 ÷ dry film. At 30 microns: 550 ÷ 30 ≈ 18 m² per litre; at 40 microns: 550 ÷ 40 ≈ 14. That is the sheet’s range. Raw end grain and open-grained timber drink more, so expect the lower figure on new joinery.
How much to buy
| Area | Wood Primer, 1 coat |
|---|---|
| 20 m² (about four door leaves, both sides) | about 1.1 to 1.4 L |
| 50 m² | about 2.8 to 3.6 L |
| 100 m² | about 5.6 to 7.1 L |
Mistakes to avoid
- Priming damp wood. The preparation guide starts with dry timber.
- Skipping knotting. Untreated knots can show through the finish.
- Using the wrong thinner. The sheet lists National G.P. Thinner.
- Recoating early. Wait the full 8 hours at 30°C.
Frequently asked questions
Can I stain or varnish over it?
No. It is a white, opaque primer for painted finishes. For a natural wood look, use Wood Stain or Synthetic Varnish. See all wood finishing systems.
Does it work on MDF or plywood?
The data sheet lists softwood, hardwood, plywood and chipboard. MDF is not named; ask us before using it on MDF.
Buy in Sharjah and Dubai
Al Tashteb Al Saree is an authorised National Paints retailer in Bu-Tina, Sharjah. Message us on WhatsApp for Wood Primer and G.P. Thinner.
Sources
All via AEC Online, retrieved 4 November 2026. Quantities are our own calculations. The main image is illustrative.
