Prepare your timber for long-term performance with the Osmo 4001D WR Base Coat, a clear, 2.5L wood treatment specially formulated to protect exterior wood from the elements—without altering its natural appearance. Ideal as a first coat in the Osmo system, this deeply penetrating formula offers exceptional water repellency while defending against blue stain, rot, and insect attack.
Not only does it fortify your wood against moisture, but it also reduces swelling and shrinkage, helping to preserve the structural integrity and appearance of your timber year after year.
Key Features:
✔ Extremely Water Repellent – Creates a durable barrier against moisture ingress
Protects Against Blue Stain, Rot & Insects – Prevents biological threats before they take hold
Minimises Wood Movement – Reduces swelling, warping, and shrinkage
Clear Finish – Enhances longevity without affecting the natural wood grain
Ideal Base Coat – Designed for use under Osmo exterior finishing products