Total case mod noob here asking

Bondo is a body filler used for cars to fill in holes and imperfections. Modders use it to do the same such as making a jagged fan hole cut smooth on their cases. It can be baught for about $7 at Wallmart (auto section) or any automotive store.
 
Bondo is mainly for patching up holes. If you're creative you can do some other stuff with it but I wouldn't try making any large structure out of it.
 
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