First it is mandatory to know that is filling is not a permanent solution to fill a patch and get life up to 6 months.
Hair Patch after Filling- Click to enlarge
After filling a patch, the life of filled hair will be 18 to 30 days depend on the usage of the patch. Maximum filling allowed will be 3 to 4 times. After that the base going to shrink and fitting on the scalp is not good. It might be loose the attachment again and again. So its better to buy a new one to get it installed.