International Yacht Primer has been replaced by International One UP Undercoat Primer White — a single‑pack primer/undercoat for use above the waterline, compatible with all International one‑pack finishes and deck paints; easy to apply by brush or roller and gives a smooth finish to reduce sanding time.

• Pack size: 750 ml
• Colour: White
• Number of coats: 2–4 coats of 100 µm (WFT)
• Practical coverage: By brush/roller 9.0 m²/L (96.9 ft²/L)
• Application method: Brush and roller
• Typical shelf life: 2 years
• Substrate compatibility: Suitable for all substrates (thinning is not usually required)

Thinning is generally unnecessary; if required, thin up to 10% with YTA800 Thinner No.1 — additional coats may be needed to achieve the specified film thickness. Colour images are indicative and may vary with screen settings and lighting.