So my flooring is luxury planks, tongue and groove. Every so often I come to a plank which is very difficult to get to sit up against the next one perfectly, so that no seam is visible. I've tried everything I can think of...taking it out again and re-angling, tapping block, etc. The problem shows up particularly at the end of the room, where the last row needs a pull bar. Even using the bar I still seem to get this annoying little gray seam left visible. Worse, though I didn't notice this at the time, there are a couple of planks like this in the middle of the room that show this gray edge when they catch sunlight. It seems that the slightest tiny misalignment causes this and the manufacturers shouldn't have used gray along the edges of their planks. Is there a way to fix this?

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    Do you mean fix it after the flooring is installed, or while you're installing it? I'm not sure it's reasonable to expect a plank flooring to end up seamless. – isherwood Jun 18 '17 at 16:47
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    Sometimes warming the area thoroughly with a hair drier will soften things enough that they will adjust. A speck of something can get in the joint and hold it apart, or there can be a ding in the interlocking piece. Warming may help the speck get embedded into the material and out of the way, or the interlocking edge will conform (if the installation is still in progress, it's better to fix it right, though). If all else fails, they sell color-matched caulk. You can work a tiny amount into the gap. Wait to do this, though, as it might fix itself over time, which won't happen if you fill it. – fixer1234 Jun 18 '17 at 17:58
  • Here is what I mean by the grey line effect. Sorry for the dust etc still on the floor. As you can see, the line is really unsightly. The other planks in the main room don't have this problem, and I've tried everything I can think of. I'll try the hair dryer trick, but it's already very warm here during the day. imgur.com/a/VcvbJ – diyhopeful Jun 19 '17 at 17:55
  • I don't bother with engineered flooring but know manufacturers sell markers to help cover scratches. MiniWax sells markers in each of their wood stain colours for the same reason. Perhaps such would work? I'd prefer to focus on why the boards aren't fitting snugly. – James Olson Jun 24 '17 at 20:59

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