I'm sure I've brought this up before. Over at AGO, there was a member there for a while, PiPUK, who was a chemist at a blender of detailing chemicals in the UK. In the same vein as Ron Ketcham used to pierce some detailing myths, PiPUK would tell us that sealants are a lot more rugged than people think, he related that when they would mix up a batch of sealant in a big stainless steel mixing tub, it was a lot of effort and strong solvents (toluene as I recall) to get the residue out of the tub. He suggested that when people complained about a sealant not lasting, they were probably misinterpreting what was happening.
Things got rolling with this thread by SwanicYouth:
https://autogeekonline.net/threads/...k-blackhole-wolfgang-dgps-blackfire-wd.59116/ where he tested a bunch of sealants and couldn't remove them.
Then later PiPUK demonstrated "clogging" of a sealant:
https://autogeekonline.net/threads/lsp-stripping.64998/
Unfortunately, the pictures have not survived in either of these threads.
I think the lesson here was, even with sealants (as opposed to coatings), they were harder to remove than thought, and they clogged easily, making you think they were gone. So it's not hard for me to believe that coatings get clogged, you think they've failed, but if you decon them, you can find out that they are still there underneath. I do have to agree with Dan, that coatings that clog easily are probably not the best coatings from a certain standpoint...but I could also argue that you could have a really durable coating that you might be able to decon every year for 10 years and it would still be there...is that better or worse than one that lasts 2 years without clogging but then is shot?
And I'll add as I always do...back in the day when members would do a Dawn wash and get completely flat paint and think they had removed their sealant or wax, and then put fresh LSP on, thinking they were putting it on a "naked" surface, they were probably putting it on top of the Dawn that was stuck to the top of their previous LSP, so factor that into your LSP testing.