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1500 grit? May as well use typing paper. 600 grit is about as fine as I use. After that it's steel #0000 wool. It works great for me but may not work for everyone.
You are confusing the two common sandpaper grading systems. P1500 is only equal to the US standard 800 grit. Still mighty fine, but not nearly as fine as it seems.
Steel wool has no place in stock work, ever. That despite the fact it was used for a very, very long time.
