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As always, I would follow what @Bobbo says, but if you are going to buy another treatment, I really like the Ronseal Deck Protect. It creates a waxy finish that beads water off really well. I try to put it on the deck once a year and it's still looking great 4 years on. You can give multiple coats, but you need to put subsequent coats on before the first one dries or they will just bead off too.
Paging the oracles - I’m having a go at my first proper woodworking project. Pine wood, will be outdoors, plant pot shelving thing. Was planning to treat with Teak Oil. Will this be effective on pine? Should I prime the pine? Should I use something else? Should I apply the oil (or whatever) before or after assembly? Muchos gracias!!