Got a huge chunk off my aero bumper

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I was wondering whats the best way to replace the void in the bottom of my aero bumper? it looks like a square chunk was tore out. Any ideas?

[silpena]

fiber glass matting and fiber glass resisn should do the trick. Then after that you hae the choice of using a short strand fiber glass reinforced filler then use polyester glaze then repaint it or just leave the matting and resisn at it is.