Hi
I used Glass Cast 3 for my mosaic table top project. I followed the instructions measured and mixed the the resin. Once I poured it I left it to set for 48 hours. The resin had set well and was clear so I took the table top outside. The following morning I noticed some white wavey lines had appeared in the resin. Picture attached.
I was wondering if there was a way to get rid of these lines.

To me it looks very much like you didn't mix well enough at the walls and corners of your cup. Seems like this was the very last resin you poured around the table and it didn't had perfect mixing ratio.