dreadvik - at first I wasn't having a problem with the velcro coming off until recently, about 6 months after first sticking it on. i just used duct tape to fix my entry (adhere velcro to panda plastic). Hope that helps!
Keep it sig'd bro I shall be watching as I'm fixing my door soon with a mixture of no more nails glue and staples to stick the velcro to the frame and same with the material. Fingers crossed this time! Then I just need to make sure the exauhst hose stays in the cutout and doesn't leak etc Gonna seal up my room proper with that crazy waterproof paint too