As you go up in grits, change direction so you can see if you have all the scratches out from the previous grit. Mr. Apelt's "how to make a knife" sticky has some info on it I think.
This is from Stacy's sticky:
"When the bevel looks good, and you are happy with the plunge lines, it is time to start sanding. Sanding is where the blade shape takes on the final look. It goes fast in the coarse stages, and slower in the fine ones. Use even firm pressure on the sanding block. Avoid using a piece of folded up sandpaper and your fingers. You can easily make dips and waves in the blade that will show up after the final grits like a fun house mirror. Grits below 400 should be done on a backing block and applied just like they were a file. Finer grits don't gouge the metal as much and can be worked without a block if needed, but the block is your friend if you want straight and flat bevels.
Once the filing is done, you can remove the tape from the tang area, but be careful that any sanding done at the ricasso still leaves the tang flat.The tang does not need to be sanded smooth, and bonds better with a rougher surface. Initially,a few strokes of the file to assure it is flat is all that is needed.The best way to avoid the ricasso dips is to flat sand the tang and ricasso area together with the paper laying down on a smooth and flat surface, and moving the knife over it in smooth strokes. Sand the tang/ricasso to 200 grit, then gently sand the ricasso area to 400. Now, you can proceed to the blade bevels without much risk of rounding the ricasso up under the handle. When the entire blade is sanded to 400-800 ( except the tang) and all surfaces are scratch free, the blade is ready for HT. Drill all holes in the tang before the HT. You will really hate yourself if you don't. Also, the holes should be larger than the rivets/bolts used, so for an 1/8" pin, drill a 3/16" hole;3/16" -drill 1/4";etc. Too large isn't a problem....too small is a big problem later on after the blade is hardened. "
If I read this it says that any sanding under 400 grit should be used with a block and in the same direction and way that you filed....
The reason I ask to make sure is because like in this case the included instructions that Stacy sent me were different and didn't say this information. It only said to sand to 400 grit and a couple of sentences about the ricasso.
HOWEVER.... rannalf, I did do what you said already and I did catch some scratches that I did not see before doing that.
I will just continue to do what I think is right and post pictures for you guys to show you what is up and just do it from now on......