LOSP-treated timber should never be used in ground contact. Furthermore, as with any treated timber product used in weather-exposed applications, a post-treatment protective coat should be applied, such as paint or a similar film-forming finish. This is essential for optimum performance of LOSPs. Note that some manufacturers guarantee the performance of their LOSP-treated timber only if such post-treatment applications are made. For best results, the post-treatment application should be re-applied from time to time, as a regular maintenance practice.
LOSP treatment may interact with some surface coatings. For example, residual solvent from the LOSP treatment process may interfere with both adhesion and drying of the surface coating. In addition, water repellent agents in the LOSP may affect the adhesion or spreading of some coatings. LOSP-treated timber suppliers may provide guidelines for painting, but you should always follow the surface coating manufacturer's instructions. The Australian Paint Manufacturers Federation can also be contacted for advice.
It is essential that all exposed surfaces resulting from cutting, notching or drilling of the timber during installation are resealed with some form of supplementary preservative. Suitable 'in can' preservative solutions can be obtained from most timber, paint and hardware suppliers.
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