How to use lapping grit?

[binder]

I am trying to flatten a Norton 4/8K stone with silicon carbide lapping grit. I put some grit: 280 on a granite tile with a sheet of plastic on it, add a little water to make a slurry and move it in a figure 8 pattern. On the 8k side I got the stone smooth, but the 4K side is flat but I can't seem to get it smooth. I have spent some time on it. Does anyone have experience with this? I thought maybe there is something I am doing wrong. I know the 4K can get smoother.

Thanks

 

[UPD]

Wet/dry sandpaper... buy several grits on up to as high as you want.

 

[life2short1971]

Perhaps less pressure? also the 4k will not be as smooth as the 8k.

 

[Kentos]

Are there scratches on the 4k side?

 

[binder]

There are no scratches on the 4K. Just doesn't look smooth. I used some 400 wet/dry sandpaper on the 4K. I think it got a little smoother. I spent over 2 hours on the 4K with the 280 grit. The 8K took only about 15 minutes.

 

[Kentos]

The coarser grit stones will not look as glossy as the higher grits. As long as the surface is even you should be good.

 

[life2short1971]

If you used 400 on it then its as smooth as it gets. It never will be glassy.

 

[LessLemming]

280 loose grit is extremely aggressive and coarse. Remember: the whole grit participates in the abrading action. Unlike with sharpening stones the loose grit is not held in a matrix of binder with only the tip sticking out.
So 280 loose grit will cut much more aggressively than a 280 grit stone. Especially because the loose grit most of the time consist of silicon carbide which is especially aggressive.
Get yourself loose grit in 400 to finish your stones and use less pressure. This worked miracles for me

 

[honed]

280 loose grit is extremely aggressive and coarse. Remember: the whole grit participates in the abrading action. Unlike with sharpening stones the loose grit is not held in a matrix of binder with only the tip sticking out.
So 280 loose grit will cut much more aggressively than a 280 grit stone. Especially because the loose grit most of the time consist of silicon carbide which is especially aggressive.
Get yourself loose grit in 400 to finish your stones and use less pressure. This worked miracles for me

Yep, that is great advice