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My understanding is that poly, while a tough durable finish, does not adhere well to other finishes (in theory anyway). It relies on a mechanical bond, which is why you sand before each coat, to create small scratches for the new coat to fill and "cling to". Or something like that. Sanding sealer probably sands out so smooth that maybe the poly wont cling quite as well. I'm doing this all from memory and its been a while since I looked any of this up or talked to anyone about it. I could be wrong-some of the details are a bit fuzzy. I try to avoid poly when I can. it is harder to get a smooth finish on I find. It is a tough finish which makes it tougher to sand to get smooth etc.
Just more work unless you really need its toughness.
In practice, I'm with you-never had any problems with anything over sanding sealer. I'm sure in the lab, they figured out it doesn't quite hold up as well while doing trials with it.
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