I have a fiberglass shower pan in my basement shower which is leaking. After much detection, I found that the leak is from the joint that connects the drain to the pan. I have attached a picture.

I wonder if there is some liquid sealent that I can pour into the joint which will eventually seal the joint. I cannot take the drain out with ripping out the shower. The original drain, I believe, is screwed from the bottom of the pan before installing the pan. I do not have access to the bottom of the pan with out removing the pan.

I wonder if there is an easy fix for this...

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