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Tamiya 87068+87069+87070 Model Polishing Compound Coarse/Fine/Finish 22ml Set

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Tamiya 87068+87069+87070 Model Polishing Compound Coarse/Fine/Finish 22ml Set

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Am I able to make a homemade model putty with household items that won't destroy my model? It doesn't quite fit right and I would like to fill it in, but I