I used some of the fibreglass jointing tape for doing walls behind a hole in a car door to hold the filler in place - worked great and noone knew that there was a massive rust hole there for many years - otherwise it would have failed its check and I would have had to pay a certified repair place to fix it and crap
So if it holds together with a door slamming open and closed all the time, it should be fine on a control panel
