Chosen Solution

Title says it all pretty much. I was using compressed air to clean the mic grill of my Pixel 4 XL and the rear glass started lifting up/inflating slightly from the frame. I think air was coming out of it. Did this just damage any of the water resistant seals on the phone? The rear glass went back flush with the phone and it doesnt seem as though anything is damaged. I’m just worried that I may have damaged the water resistance seal in the back of the phone.

It is possible that you damaged the waterproof seal, however, if its any reassurance,the waterproof seal was probably compromised anyway. This happens over time with normal use.