Its very common happened to my fathers started to lift it was repaired and you cant tell it was done. my mate that works at the panel shop that fixed it actually he fixed it said they do heaps of them. to fix it properly they remove all the sealant from the channel and put real sealant in there not crap then repaint not just blow over it like nissan did originally. id get it done if i own it. if it goes to a decent panel shop you should never be able to tell its been repaired. my mate told my father not to worry about it but my father is picky and wanted it fixed. mate said once he broke the skin of paint it just fell out (sealant)
So if left it would of been a big problem down the track. so id make nissan fix it under warranty if you have the issue and still under warranty
So if left it would of been a big problem down the track. so id make nissan fix it under warranty if you have the issue and still under warranty