Osmo 4001 WR Base Coat is a clear wood impregnation for exterior use. It is a preventive preservative with active ingredients to protect against plant and animal pests such as blue stain, rot, mildew and insect attack. Nb. 4001 is the replacement for 4005 with the key differences that it is now oil based and contains protection against insect attack as well as biocides.

The base coat penetrates easily and deeply into the wood - proving extra moisture protection for the wood. Key features include:

Clear (4001), exterior base coat only
Especially recommended for windows, cladding, garden furniture
Reduces swelling and shrinkage and protects against fungal, algae, blue stain, mould growth & insect attack.
Extremely water-repellent, extra moisture protection
Ideal primer for Natural Oil Woodstain, Natural Oil Woodstain Effects and UV Protection Oil
Will improve the coverage of the above when used on rough sawn timber
Available in 0.125, 0.75 and 2.5 litres
1 litre covers approx 5 - 6 m² with 1 coat. Product coverage will depend significantly on the wood's characteristics. These figures are for smooth planed or cut timber. Other surfaces such as rough sawn, aged timber etc may lead to significantly reduced coverage.

Number of coats:
1 coat, a top coat from the Osmo product range must follow.

Application:
Apply by brush, dipping or flooding, spray only in an enclosed unit with appropriate protective equipment.

Drying:
Approximately 12 hours in normal climatic conditions (23°C & 50% relative humidity). Lower temperatures and/or higher humidity can increase the drying time. Allow good ventialtion when drying.

Storage:
Up to 5 years or more if the can is kept dry and sealed tightly. Store away from direct sunlight and extremes of temperature.