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I have just spent the summer dismantling rotten old decking. It had lasted at least 7 years (since we moved into the house) plus however long the previous owner had installed it before then.
The treated timbers (including the actual deck boards) were mostly still fine. The untreated timbers were all completely rotten and falling apart.
Your deck boards will surely be already pressure treated and don't need anything more, apart from where you make any cuts
I am just about to put my basic decking together. Will anyone tell me I don't need to bother treating (either the frame, or the boards, or ideally both) with anything as pressurized timber should be fine? I assume the advice is apply 'deck protect' or similar to everything liberally. But obviously I'd rather not if I can get away with it....