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Any surface you want flat you need to board sand. It is really a good idea to spray a high build primer, spray a guide coat, then board sand to see if you have any high or low spots. You can then fill the low spots. Any spot where you sand all the way to the glass will need to be glazed over before painting or you will have pinholes. DO NOT TRY TO FILL PIN HOLES WITH PAINT OR YOU WILL BE SORRY YOU DID.