Even with an original seal, there really isn't a 100% waterproof phone, if you search Pixel 3xl back housing seal you will find some with the same shape and size as the original, i woud recommend using a proper seal made for your phone model because doing it by hand with double sided tape will often leave gaps in the corners where dust and liquid can come through.
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Honestly just closing it well enough with tape or glue you have should be fine, but like i said, phone are not waterproof.
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Honestly just closing it well enough with tape or glue you have should be fine if you are the one using it, but like i said, phone are not waterproof.
Even with an original seal, there really isn't a 100% waterproof phone, if you search Pixel 3xl back housing seal you will find some with the same shape and size as the original, i woud recommend using a proper seal made for your phone model because doing it by hand with double sided tape will often leave gaps in the corners where dust and liquid can come through.
Honestly just closing it well enough with tape or glue you have should be fine, but like i said, phone are not waterproof.