Most hardware stores carry sheets of wet dry sandpaper.
How to sand sheet metal.
Because 80 grit is pretty coarse stop using it when the paint is almost all the way off.
Use pieces of either sandpaper to remove pockets of the material that might have been left in the tight spaces.
As the rough edges are removed switch to finer grit sandpaper.
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When you have removed much of the unwanted material switch to 200 grit sandpaper to finish off the sanding process.
Pick up a sheet each of 400 600 and 800 grit.
To refine the surface of your metal you ll use sandpaper across a gradient of grits from relatively coarse to fine.
That dust causes silicosis.
The best way to sand is along the grain of your metal if any is present else you can always do it in circular motions.
I ve hit rusty sheet metal with sand just kept the feed higher lower pressure and further distance.
Use a polishing pad once the metal is smooth to remove any metal dust and bring out the shine of the metal.
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Use the 220 grit sandpaper and begin to smooth the edges of the metal using light strokes.
This way you won t sand too much into the metal and weaken it.
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You can tape sandpaper to a flat surface to create a mini sanding board and get sanding boards that work like nail files.
Attach an 80 grit sanding disk to your sander and begin sanding the metal surface from which you need to remove paint.