Hi, I am apply oil based poly (thinned about 30-40%) to the surface of my wood project and end up with a lot of very tiny (not quite microscopic, but you need to be close to the wood to see them) areas where the poly doesn't settle very well. I don't know how to describe it other than it looks like little microfibre parts of the grain that the poly doesn't adhere to. I have several coats of poly applied and have lightly sanded with 400, then 600. This last time I tried 22, 400, and 600 before each coat and still get spotty coverage. I am cleaning the surface very well prior to applying poly. Is that the grain of the wood causing that or are those tiny scratches? Would it help to not lightly sand before the next coat and start building up the poly in those areas? I am new to woodwork finishing so may have don't know if this is normal or if I did something incorrectly along the way. Any suggestion? Thanks!