Hello Walt. I hope you can find a test report that Fine Woodworking magazine ran years ago, which scientifically evaluated the durability of a full range of exterior finishes. As I recall, your finish did very badly in the tests. I have forgotten what the top rated finishes were. But it would be worth you time to look up the tests if you want the best exterior finish......
But I personally used your finish on two outside jobs, and both times, it failed in less than a year.
Good luck, Chuck
Chuck Keysor (circa 1956)
PRT Alpha 60" x 144" (circa 2004)
Columbo 5HP spindle
Aspire 9.0, Rhino 5