undercoat is based off the color of your car according to ppg paint manual, there are 3 main undercoats: g1 white, g5 grey, g7 black and 2 mixes g3 light grey, g6 dark grey. if you have a pearl white or yellow most likely its white, blues and reds probably grey, black or dark cherry most likely black. have your local body shop look up your paint code and see what the exact undercoat is.
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