I usually sand down my bodies down to the line using oscillating spindle sander, instead of routing the outline. I use this sander: https://www.lowes.ca/benchtop-sande...VBWSGCh0w6gQeEAYYAiABEgJKSfD_BwE&gclsrc=aw.ds While I'm generally happy with the results I get, I'm trying to improve my work, and avoid rough spots on the outline of the body. Here is a poplar body I sanded yesterday and I have several rough spots after sanding it down. I tried sanding them with a flat sanding block with 180 grit but the roughness remains, no matter how long do I sand it for. I know from experience now that such imperfections will remain visible after finishing the guitar and I would still be able to feel the roughness of those spots through the paint. How do I avoid those while using the OSS and how can I fix the ones I have in my finish right now?