seam separation of fiberglass shower floor

Hi. I have a seam spearation in my shower floor pan...right in the corner from the floor up to the top of the pan.
the pan lloks liek corian but I don't think it is... it could be fiberglass since it does not expans when I put paper between the crack and heat it up...the paper comes right out.
It has a seam in every corner but only one has spearated. I would like to seal it with something but I am not sure what. The crack is wide eanough to fit one sheet of paper...that's it and is about 2 inches long.
any suggestions woudl be greatly appreciated. Thanks! TR

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