I have a small issue. Few months ago my apartment got renovated, and I listed all holes in walls i want to keep for future use. The rest was, depending on depth, filled with concrete or plastered. And it was done really good, I can't see these spots with my bare eyes.

Now, I forgot to list one hole, so it was plastered clean. But I need to have a hook there, and I'm reluctant to create brand new holes. I would really prefer to use existing one - I need bigger diameter now, so I can afford to be a tiny bit off, but boring new hole would needlessly affect concrete, and if it happened to be just next to original one, it would also be weak. So one way or another, I need to find old one, be it to reuse it or avoid it. But how?


The slightest imperfections can be found on a wall with a bright light, usually brighter than a flashlight, although flashlights have been used before. It may work for you since you may have an idea where the spot is to begin with.

The trick is to shine the light across the wall, hold the flashlight or light against the wall so the light passes over the wall with as low of an angle as possible. The flashlight or light is almost parallel as possible. This way the texture of the wall is more prominent, because every high spot, even the tiniest, casts a shadow. Since the repair has been made recently and has less coats of paint over it, the texture over the repair will be slightly different than the wall surrounding the repair that has more paint on it.

  • Upvote for now. Accept, hopefully, when I'll get better light than a flashlight and find that hole. As for where it was, I remember it to about a 1/4 of a square meter. Not bad, not particularly good either.
    – Mołot
    Jan 3 '16 at 15:39
  • Looking for it should/will be an easy matter with the right light in that small of an area. make sure the light is cast along the wall as long as possible. Sometimes it is a fine line between the lighhtcast touching the wall to create the shadows and just shining the light across the wall not doing anything....
    – Jack
    Jan 3 '16 at 15:49
  • Having a point light source will help, so a (bright) flashlight might be your best bet. Jan 3 '16 at 17:39

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