Stain/protectant for screen door

We live in Philadelphia, PA. My husband recently completed a screen door for the front of our house. He used Spanish cedar for this project. The door faces south (receives direct afternoon sun) and is protected from rain, etc. by a 2 foot overhang. We wish to apply a clear finish that will not noticeably change the color of the wood. We spoke with a door manufacturer who uses mahogany. Their suggestion was a Pennofin product. The feedback on your site does not agree with this recommendation. What would you suggest?