Ok,

I need to bring my Integra 94 into the shop for some unrelated body work. I thought while I'm there I should have them remove the rust on each rear quarter panel, just inside each wheel well. I've had it costed out at a few places and they all say that bondo is no good for something like that because it tends to absorb water. They either say they'll use fiberglass or weld in new sheet metal. Which is better?

Because of the repairs already being done, one rear quarter panel is already being painted completely, so, what I end up paying for is the rust repair on each side plus the painting of the other rear quarter panel. For some reason the guys at Maaco quoted me about $100 cheaper for welding in new sheet metal compared to the guys that say they'll be using fiberglass. Does either of the two methods produce better results than the other?

Thanks in advance