Instructables

Step 12: More sanding

Use 200 grit sand paper to sand off the charred outer layer then when most of the black has been removed trade up to 400 grit sand paper. Put your pipe under running water , after that pat it dry and sand it again for a while longer. Your pipe should be quite smooth now. After this is done you could find some steel wool to make it even more smooth and later shiny.
 
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