When sanding resin in an epoxy resin table up to 3000+ grit with a DA/RO sander, would adhesive-backed sandpaper give a more flat/accurate polish vs. hook and loop paper due to the potential for unevenness in the velcro system?
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No idea.
Flexible backing works well for a high polish on turned stuff, but that usually stops at 1000-2000 grit. After 240 I sand by hand anyway using strips of paper on the lathe.
Sandpaper is for making things smooth, not flat though, so it's always going to be a compromise between the slightly less flat softer backing vs the risk of digging in with the edges with a harder back.
Right on. Thanks for the info Rob.
The opposite is true. The higher your grit, the more in needs to conform to the surface in order to sand evenly. Hook and loop is essentially a shock absorber between the pad and the work surface, allowing the abrasive to slightly conform to any irregularities.
At coarser grits, a block is essential. At 3000 grit, you should be using a sponge as a back up pad
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