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Old 11-27-2013, 07:13 PM   #1
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Accidentally painted cement board - HELP?


We are installing a new bathroom and a family member which was helping us with mudding and sanding took it upon himself to paint the room with latex paint. Now, the cement board in our shower surround is painted. Is there a way that we can install tiles over the painted cement board and still get a good adhesion, or is our only option to rip out the cement board and put in new sheets? Goes without saying that this will be a WET area as it's inside the shower.

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Old 11-27-2013, 08:36 PM   #2
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Accidentally painted cement board - HELP?


I've never run into that---Here is a suggestion---paint it again with Red Guard or Hydroban---I would feel safe doing that and you will end up with a properly waterproofed shower for your effort.

If Jaz says I'm wrong--listen to him---but at this point,I feel that you will be fine if you waterproof the surface.

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Old 11-27-2013, 08:37 PM   #3
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Accidentally painted cement board - HELP?


You are new here--I build bathrooms---quite a few every year---Mike---
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Old 11-27-2013, 09:08 PM   #4
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Accidentally painted cement board - HELP?


Thanks so much Mike! I checked out the substrate preparation instructions for Hydroban and it does mention "remove dust, oil, grease, paint [...] and other materials that prevent bond". Now I am debating whether I should go at it with some sandpaper to remove some/most of the paint in order to get a better bond. Just worried about messing up the cement board even further in the process!
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Old 11-27-2013, 09:41 PM   #5
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Accidentally painted cement board - HELP?


How much paint was applied? Cement board is rough and rather absorbent----scuff sanding the wall and then applying the waterproofing should give you a good bond.
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Old 11-28-2013, 09:22 AM   #6
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Accidentally painted cement board - HELP?


One coat of acrylic latex with a flat finish was applied.
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Old 11-28-2013, 09:49 AM   #7
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Accidentally painted cement board - HELP?


You will be fine---I'll put money on that answer---do waterproof the surface--that is the insurance you want---it will add years to your showers life ---
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Old 11-28-2013, 10:01 AM   #8
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Accidentally painted cement board - HELP?


Have you ever tried to get dry thinset off of anything? That stuff would stick to a bullfrog's back side. I'm with Mike on this one. I don't think the paint will affect adhesion if that's what you're worried about.
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Old 11-28-2013, 10:28 AM   #9
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Accidentally painted cement board - HELP?


... currently breathing the biggest sigh of relief ever we were planning on using hydroban any ways - just directly onto the cement board... and were primarily concerned that the layer of paint would compromise the bond to the point where tiles could lift. We'll still be cautious and sand the whole area. I actually went at a small area with a wet scouring pad and was able to get some off with that alone.
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Old 11-28-2013, 11:23 PM   #10
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Accidentally painted cement board - HELP?


I agree you should be fine. I would let the paint cure though, I think 2 weeks is plenty. Go ahead and rough sand if you like. Also it would be a good idea to give Laticrete a call just in case there's a reason not to proceed.

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