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Welcome to the Bunnings Workshop community @Willy1. It's terrific to have you join us, and many thanks for your question about treated pine.
Treated pine can naturally expel resin for several weeks or even months after milling. Unlike dressed pine, which tends to have fewer knots and less resin, treated pine sleepers used for landscaping are not graded to the same standards and often contain more resin. To stop the bleeding, the timber will need to expel the resin naturally. After several weeks, you could try painting the bench with an oil-based primer and paint, which typically helps block the staining caused by the resin.
It's worth noting that CCA-treated timber's sole use is for landscaping, such as creating retaining walls. It is not recommended for use in high-contact surfaces like benches or tables, as the treatment contains an arsenic component. I would highly recommend painting the bench to help mitigate the staining and to reduce contact with the chemicals in the timber.
Another option that would help solve the resin and chemical issue would be to clad the bench with Merbau decking. That would conceal the bleeding resin and also prevent contact with the chemicals.
Please let me know if you have any questions.
Mitchell
Hi @Willy1,
You could wait several weeks and then sand the residue, stain the timber, and coat it with an exterior varnish such as Bondall 1L Satin Monocel Gold Marine Clear Timber Varnish.
Mitchell
