These Treated Pine Dressed posts are pre-primed and finger jointed to allow for long lengths and straight posts. They are treated with LOSP to H3 for above ground use only. Whilst this product has been pre-primed to ensure they are protected during transit upon reaching your job, it is very important that all 6 sides of the timber (especially the end grain) are again primed and coated with an exterior paint for longevity.
Follow this link for technical information on how to protect your Treated Pine product
Technical Recommendations for Protection of Treated Pine H3 Products