Microcement is blotchy after sanding

  • Erstellt am 2024-03-12 23:05:33

DIYtester

2024-03-12 23:05:33
  • #1
Hey everyone! I am currently working on our concrete staircase with Beton Mineral from residence (Schiefergrau). I am initially satisfied with the processing. However, it looks catastrophic after the first sanding. It is completely spotted. I have attached a picture after sanding… Maybe someone can help me or has an idea how to prevent the spots. Best regards
 

KlaRa

2024-03-13 10:31:20
  • #2
You will certainly not be able to prevent the different color variations after the mechanical processing. BUT! Mineral surfaces should definitely be provided with a surface protection. This could be, for example, a colorless resin-based sealant. I assume that the surface protection can achieve an at least largely visually identical surface appearance. Please keep in mind that cement-bound building materials, including concrete as well as cement screeds, naturally can have different absorption behavior in different areas. This is material-specific. This can also easily result in "cloud-like" shading. If you want to completely exclude this, you probably have to use a pigmented sealant (after prior priming). --------------- Regards: KlaRa
 

Alfredlima

2024-03-21 13:52:57
  • #3
Did you apply two coats? Since you sanded first, this seems to be the result after the first application?

Did you apply it using a stainless steel spatula? What sanding pads are you using?
 

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