I am trying to go the extra mile on my Q*Bert restoration... so far, it's all sanded down with 220, bondoed, and ready for primer... I applied bondo to all 4 corners and they seemed sturdy at first, but as soon as I tipped the cabinet over to sand, the bondo from one corner broke off. I am now wondering if my other corners need reinforced too. I've heard that fiberglass resin is good for corners but I'm still wondering how it's going to stick to this surface, as it's almost flat... I've attached a photo of the corner. What would be your approach? I'm beginning to wonder if I should just let it go because it's not that bad...however, I just wanted to see if anyone had any insight.

