With most well-built products, things do not tend to just "pop-off", unless that is part of the function or maintenance design. MTH made well-built stuff.
I tried to "pop-off" the dynamic brake "blister" on a pair of MTH GM&O GP-38s, as the GM&O's GP-38's had no dynamics. I wanted to make them more accurate, and I had some matching paint.
Well...MTH (Samhongsa, really, I guess) apparently had Ultimo Atomic Glue, because it was a real job that required a bit of body work filler to correct the gouges and sanding. The locos looked good in the end, actually, but be careful. If the tank platform is sacrificial, go that route.
(Williams GP38's dynamics do "pop-off", I believe, sometimes unintentionally)