I'm working on my first table and I have a couple of light areas that appeared on the tabletop after I put on finish. Here are some pictures of the light areas: (red arrows point to the areas)
It is much more noticeable in person than on the picture.
I used red oak wood and the finish was "Deft Step Saver, burl walnut." After I glued the boards for the table top, I sanded first with a belt sander and then an orbital sander. I spent hours sanding and ended up with a rather flat top. I think the light areas are caused by glue, but I'm not sure. (considering I spent so much time sanding, I thought all of the glue would have been gone) If it is glue, would the best thing to do is to resand that area on the table top and then restain that area?
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The spots are glue stains which weren't fully sanded out. You might be able to use a touch up marker to cover the spots up but on a table top which is highly visible it would probably be a lot easier to take the stain off with paint and varnish remover and sand the table again. You could just sand it but the stain would gum up the sandpaper so bad it would save you a lot of work to strip it first.
The next time you glue wood up like that if you would wash the excess off with a wet rag it would save you from this happening again.