I am not sure what "glued area" means. I know of no glue used in these filter motors. Please read the extensive information on leaks in our blog.
https://www.renaaquaticsupply.com/Basic-Troubleshooting-for-the-API-and-Rena-Filstar-Filters_b_6.html
or
https://www.renaaquaticsupply.com/blog.asp