I have a frame that I'm looking to get repainted. It has a tiny dent in the top tube and a good-sized section of chainsuck on the chainstay. I'd like to somehow fill these in. I was thinking of just going with a powdercoat since it's cheaper. But, would I still be able to fill the dents with say Bondo? or would I need to fill it with something metallic like brass or silver?