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With all repairs completed in 80-grit, or even finer, they should then be gone over with 180- or 220-grit to smooth them even further, then the DA can be used with 220-grit to feather the edges of all repairs prior to priming. This is especially important if you're going to prime over the edge of old paint, as deep scratches may come back later to haunt you as shrinkage marks. View Related Article
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