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Block sanding
When I said do not block sand in an X pattern it was meant for the final sanding with the 600 to 800 grit paper. You should already have a good surface from sanding in an X pattern on the 80 or 180 grit paper during your prep stage before you switch to the higher grits. Sand with the direction of the car on your higher number grits. Always refer to the product data sheets for the final grit sanding. You can never go wrong if you follow their sheets
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