Need help on choosing the best transparent or semi transparent penetrating sealer

Hello I just recently built a new outdoor red cedar barrel sauna and a cedar deck to match. Both items are in direct sunlight and I'm looking for some recommendations on the best UV protection possible.

I'm looking to get a transparent or semi transparent penetrating sealer.

I understand that being in the transparent to semi transparent range that it will not offer as much UV protection but we are looking for a more natural lighter look. We're looking at reapplying it quite frequently if needed to keep the look. I have used Readyseal in the past for some cedar gates and it applied very well I just don't know if it has the best UV protection built into it.

If anyone has some experience or suggestions I would love to hear from you thanks.