I'm having a sanding issue.

When I get to 240,320 and higher I'm getting these ugly little patches building up where the end grain meets the sidegrain.

Any help appreciated,Thanks!

Welcome! Are you sanding a turning?

Welcome to the forums. I think what you are describing is tear out. Some tear out does not show up to our aging eyes until we remove all the other distractions. Usually we have a rough surface when we start to sand ( unless you have a lot more experience) . This surface kinda masks the deeper marks and tear out on the surface and when they are removes the remaining show up better. It is common to get tear out where the grain changes in two places opposite one another.

 

Solution 1. Don't get tear out to start with. Sharpe tools and better technique.

 

Solution 2. Not the best way to get there but sand the whole bowl.

 

Solution 3. Sand only the bad spot. In most bowls unless the spot is really deep you are the only one who will know but you that it is no longer round , altho we could talk about "round" awhile.

Hi Paul,

 

If you are sanding plank, maybe it is pitch buildup at the end grain? And going to a scraper might create even more of a headache solve the issue?

 

I'm big on sanding to remove all marks, then hand-scraping. My forearm tendons, they want me to get a different hobby. Maybe collecting videos of people knitting.

Welcome to The Patriot Woodworker Paul. Great to have you on-board. You must live just "down the lane" from @HARO50. 

A bit confused with your question. Are you referring to turnings or "flatwork" where two boards meet in a corner? Pictures would help a lot. Easy to post them here, but if you need some guidance let us know.

 

Glad you found us and hope you hang around with us. Great group of folks here. Plus John needs the support living way up there.

Welcome Paul.  Glad you found us and look forward to your participation.

 

The fine dust may be building up on the paper and leaving it at the end of your stroke.  Sanding that fine is usually done during finishing between coats.