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Old 11-21-2013, 09:30 PM   #1
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Mapei ultracolor plus removal

Today I applied mapei ultracolor plus, but the color is off, so I decided to remove grout and put different color... Tiles are 24x24 3/8 over ditra over osb. Joint is 1/16. I started removing it approx 3 hours after installation an its very hard already... I'm using small grout removal tool...

So do I need to remove 2/3 of grout? I'm currently at 1/4... I'm using same grout just different color, so it should stick to same grout, no? Also do I need to dampen old grout to increase bond? Ultracolor plus says it is water-repllent.. Thanks.
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Old 11-22-2013, 07:21 AM   #2
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WAIT! You don't necessarily need to remove the grout. You can use Grout Refresh to change the color:


If you do decide to continue to remove the grout you will need to use a grinder, your grout removal tool is designed for small areas, not an entire installation. Ideally it's best to remove it the thickness of the tile (3/8" from the sounds of it in your case).

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Old 11-22-2013, 01:00 PM   #3
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That grout gets super hard really fast, as you've found out. You may need to use a grinder or dremel and diamond blades/disks to cut the joints out at this point. And yes, you still need to get to 2/3 tile depth for new grout to grab onto the tile sides.

We typically use grout colorant when we get stuck with a color shading issue, but if you've already started cutting the joints out, I believe you're committed to that route now.

"the road to hell is paved with osb, mastic, pre-mixed latex 'grout' or 'thinset', "
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Old 11-22-2013, 05:01 PM   #4
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Thanks guys.. 1/4 I meant in inches(1/4"). Its good I started removing it right away, because 24 hours later it really became hard... Its good that area was small and big tiles Approx 45sqf.

I made some tests.. I removed hardened old grout from plastic container and applied new grout to the smooth side to see if it will stick... and and it seems it sticks to itself really well... I couldn't separate at the seam... so to rough grout it should stick even better.
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