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damage with hand as referenceclose up of damage

There seems to be two layers on top of the concrete:

  • the thicker, white-ish layer next to concrete
  • the gray, textured layer on top

I'd like to fix this up, but have no idea where to start. Would really appreciate help to

  • Identify the layers
  • Determine steps required to fix
  • What the heck are you using for chain lube ? – Alaska Man May 9 at 20:06
  • That is a skim coat, or a sprayed texture. you may match the texture but the color will be off. Match the texture and then paint is your best option to hide the flaking coating. I would think your cleaning did more damage than the chain oil. – Ed Beal May 10 at 6:38
  • Thanks @EdBeal! I should have taken some before pictures. At the time I was confident that the oil did enough damage that it was too far gone, but I'm definitely no expert! To confirm my approach: 1. Patch the area with this skim coat & patch. 2. Find similar paint (mix with texture aggregate?). 3. apply paint, wait to dry. Does that sound right to you? – BreakerOfBalconies May 12 at 19:34
  • Yes this is the method I have used to repair failing coatings in the past. – Ed Beal May 12 at 20:30
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Hmm, if it didn't look so new I might think it was a type of flooring that was common in the mid-20th century known as magnesite, also called "Diato" I believe. That was a mineral pour-in-place material that was often used to protect concrete decks and other outdoor (and indoor) floors and structures, like stairs.

I don't see any chance for you to try to fix this with it being un-noticeable. The closest you might get is to use a hard-setting repair plaster to fill just below the level of existing, then buy some paint to match, add aggregate to try to match the anti-slip treatment on there, and brush/roll to blend. I still think it will show, and it might crack around the repair because different materials tend to do that due to different flex, expansion and contraction properties.

Good luck.

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