I put 3 coats of spar on a wooden table. Unfortunately, there was a lot of dust particles on it as can bee seen on the lower piece in the attached image. So after doing some research I sanded it down with 400 grit sand paper. I did this by hand and tried to be careful not to take too much off. However, as you can see from the piece in the upper part of the image it has become dull with just a few shiny spots left. Reading many articles/posts and watching YouTube videos it appears to me that the shine shouldn't have gone away. I am saying this because everybody says you just sand it down a bit (some say 400 grit, others up to 2000 grit, others steelwool, etc) and then you buff it out with an automotive buffer. I didn't buy that yet but I can't image this will bring an even shine back on that upper piece. So what did I do wrong and where should I go from here?
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