Hello. First time using brush on polyurethane. I am doing a long craft table top. I sanded the top down using 220 grit with ROS. In hindsight after reading here, I would have liked to have followed this up with a hand sand in the direction of grain. I did a very thin first coat of Gloss Poly (full strength) and did not have any issues. But it was very thin. After sanding, I have put down a second coat and it is currently drying (Can states 48 hours). Second coat was put on much thicker.
I checked on it now after 12 hours and it looks like the poly has dried or is no longer there on one edge. Is this because the work piece may not be perfectly flat? Can it be resolved by doing a 3rd coat in the "low spots"? or should I go over the entire piece with the 3rd coat?
There is a good chance that I put too much pressure when sanding between coats and I may have cut through the first coat in spots.
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