Yes, I was intrigued to read your post about the silicone-like paint...because I had been looking into Eternabond and wasn't happy about how expensive it was. Then I saw how expensive the paint was (here in Canada).I see no reason why it couldn't be used to just cover seams.
It's consistency is like white silicone caulk that's watered down thin enough to put on with a brush. But it's still very thick and sets up very quickly. You have to be completely ready to go and no pauses (for a large surface). It starts to skin and get little boogers in it after about 10 min.
For just doing a few seams, that wouldn't be an issue.
$100/gal? That's an issue.
Eterna bond tape was mentioned.
I don't know if the tape or silicone would last longer. No experience with the tape or how it lays down, if it needs to be replaced every so often, etc. The silicone obviously leaves no air gap and seals really well, but I expect needing to refresh it every few years. I haven't heard anything negative about the eterna bond yet and I'm pretty sure a few members used it awhile ago, for seams, around vents, etc.
I have a feeling that Eternabond would last longer than the silicone but am not certain (I'm only going on how silicone caulk at home doesn't last).