A high-performance water-based coating system. Background, experimental evaluation and practical experience

Conclusions

Provided that the joinery is well constructed and the coating application is thoroughly undertaken it is possible to use a multiple, water-based coating system with a maintenance-free period of minimum 5 years.

In this respect the multiple coating system gives adequate durability to the Scandinavian system used presently with double vacuum impregnation + 2 spray coats.

The key factors for this system are:

• 1. Water absorption has to be prevented

• 2. Microbial infection on the coating surface, in the wood coating interface and in the wood itself has to be prevented.

• 3. The wood has to be protected from excessive moisture uptake and UV-light.

• 4. The treatment has to reduce rapid moisture fluctuation or dimensional changes.

• 5. The film should be essentially free from defects like air-pockets, pores and poor wetting at the edges.