Exterior Furniture Finish - Problems

I’ve just finished my first piece of outdoor furniture and promptly put the wrong finish on it, Tongue Oil. I ran out of what I had (no mention of interior use only on the label) and bought a different brand to finish. The second brand label clearly said “indoor use” so I figured I’d put another product on top of the Tongue Oil. I tested Spar Urethane over Tongue Oil on a scrap board and it went on fine. I’ve since learned that tongue oil will repel urethanes. Great! I’ve gone from bad to worse.

So my questions are:

1. Since the urethane currently doesn’t show any sign of being repelled, will this happen over time or have I dodged a bullet?

2. Is there any solution short of stripping the wood?

Thanks in advance!

-- If you're over 100 years old there's an 80% chance you're a woman.