Sandpaper grit embedding in grain

I’ve never had this happen with good or “cheap” sandpaper, but I’ve never used silicon carbide paper either.

Maybe too much pressure?

Are you by chance folding the sandpaper which could cause the abrasive to break loose? 80 grit is pretty coarse and might not survive folding.

My fav. sandpaper is Klingspor aluminum oxide stearite.

-- Joe

Too much pressure? I generally just assume I am pushing too hard but I’m also generally pretty tense and have to make a conscious effort to relax. :[ I was folding rather than cutting.

I cut the paper. Rounded the edges of the sanding block I was using so the paper didn’t wrap around a sharp corner. Tried to pay extra special attention to reducing pressure. It seemed better but there were still some flakes.

Thanks for the suggestions.

Consider that some of the sand paper may have been damaged by moisture.

I bought about 6 packs of various Gator Grit brand at my local hardware and everyone of them sloughed off the grit very quickly.

I took them back and my friendly hardware guy replaced them.

We looked at the cases and some of them had water damage.

I usually clean up problems like that with a card scraper. Easy to make and leaves an ultra smooth finish.

-- Improvise.... Adapt...... Overcome!

The people at Supergrit explained to me that silicon carbide is for metal and alum oxide is for woodwork. (so that’s what I use)

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

That’s good to know. I bought the paper based on a few threads on here, but perhaps I needed to dig further. Looking back it appears that one member said he got the white line (the silicon carbide) while others did not specify. Hmm…

The white line discs are aluminum oxide… the white sheets are silicon carbide and are not actually called ‘white line’. The aluminum oxide sheets are just called that (though the box is labeled Rhynalox). The discs are Rhynogrip white line but the paper itself is labeled Rhynalox.

Anyways, I’ll presume that I just purchased the wrong type of sheets. The discs seem fine.