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I wouldn't use pine for an outdoor project (unless it's something really special like pitch pine).
If you are set on using softwood then cedar is just as easy to work and will survive being in the elements much better wouldn't need treating either.If you already have the pine and are determined to proceed then I'd mix 2 parts mineral spirits with one part boiled linseed oil or tung oil and melted wax from a tealight. Oil finishes are great but in terms of long term protection they sit on the surface and will eventually wash off. Using the mixture I've suggested allows the oil to penetrate the wood much more and the wax helps to form a really good waterproof layer.
Always apply finishes after assembly.
Bobbo-
I don’t expect it to last forever, and pine* is what I have - I picked up a car full of random stuff from Whittens before it closed, so it’s what I have. First project and if it lasts this year I’ll be happy!! Would I be better painting it? Open to ideas!!
*how do you work out what wood is? I’m guessing it is pine!!
LongAndWinding
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!!