What type of timber is it? Merbeau? Cutek is a good brand that I’ve used on large areas of Merbeau and it lasts well in direct sun light. Don’t go cheap of you will be redoing it a lot. Might help to hose it down over the next week or so before hand to bleed it out.
It’s blackbutt. That’s one thing I never do is go cheap on anything. I always like to get quality. It last longer.
I assume it bleeds like Merbeau when it’s wet and unsealed. Up to you but I’d go with Cutek and you will love the result. Water pretty much beads off of it. It will come up sweet.