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the 5200, when cured, has characteristics more like caulk - it is flexible. The goop is more rigid, like a cured epoxy. That being said, the 5200 is slick & slimy & takes longer to cure. Viscosity-wise, I think the goop is more viscous & would be easier to work with for this application. Also I don't know about 5200 conductivity of the soundwaves. Since it is less stiff it may interfere with the pinging. I don't see 5200 being really good for "build up" type applications, so if you have a bigger gap to fill you may be better with goop. But if you are going to be seeing extreme temp swings you may be better with the flexibility of teh 5200.
I know, I did not give any answer & I'm far from a pro on these. But I have worked successfully with both
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