Post Curing Unit for Resins

[arn11]

Hi,

I am new to 3D printing and its processes and had a query regarding the post-print process. I use a B9 creator and printed a small model of 30*30*6 mm using photo-polymer resin. I cured the print overnight using a UV lamp, with a glass slide to hold it down and had foil surrounding this setup. However, the next day I observed that the edges curled up and thus I no longer have a flat surface, which is what I require. Also, I tried duct taping the edges to slow down the curing there but it did not help. What can be done to control the curing process? Is the curling due to over-curing? Is there any particular time limit that the print should be cured for under the lamp? How else can I prevent the curling?

I have posted a picture of the print below.

Any input would be of great help.