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Unread 04-05-2020, 06:00 AM   #1
Super Grit
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Double Pour SLC

Hey guys/gals,

Helping a buddy with a small 3' x 4' shower. We are using the Kerdi pan and will be doing Kerdi on the whole shower. All this going over a concrete floor. We were mixing some Mapei SLC yesterday and the 5 gallon bucket shattered during mixing. Luckily we were mixing in a mud pan tray. We salvaged as much as possible and finished the mix and pour. Unfortunately, we lost enough material that we didn't have enough to achieve the perfect level due to a low spot around the drain and you can see a definite ridge. We only had the one bag of compound and a long way back to town, so we stopped for the day. Can we let this cure and do another pour on top of what's already down? Any special prep needed to do so if possible?

Thanks
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Unread 04-05-2020, 06:18 PM   #2
Tool Guy - Kg
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Assuming the directions were adhered to for the first pour:
Yes, you can pour SLC over SLC if you hit it with the manufacturer-specified primer. That brings up a good question...You did use the proper primer under your first pour, correct?

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Unread 04-05-2020, 06:27 PM   #3
Super Grit
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Yes we did. Exactly what is the purpose for the primer?
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Unread 04-05-2020, 07:08 PM   #4
jadnashua
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Exactly what is the purpose for the primer?
Primers help ensure a good bond. Often used on paint, cement products, and other things like a patch in asphalt. Your SLC may or may not require a primer for a second coat depending on how much time has passed between applications...read the instructions for the one you chose.
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Unread 04-06-2020, 07:35 AM   #5
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Hey Rex,

Sorry to hear about the bucket blowout; good thing you were using that mortar tub too!

You can certainly pour another layer of self leveler on top of the previous application, so long as the total thickness of the two doesn't exceed the maximum pour depth of the particular leveler you're using. Be sure to wait 24 hours before pouring the second lift, and prime again before you do so.

Let me know if you have any other questions.
Happy pouring!
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Unread 04-07-2020, 10:41 AM   #6
Super Grit
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Thanks for the great advice. I was really stressing over whether or not we could salvage the pour. Read a lot on failed SLC pours and I was nervous. Talked to my buddy so he could check the condition of the pour. Tap with hammer and listen for hollow sound, check for cracks in the pour. He said it sounded solid and no visible cracks. He will prime and we will pour the second layer later this week. Getting ready to do some Kerdi over the weekend.
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Unread 04-07-2020, 11:47 AM   #7
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Originally Posted by Super Grit View Post
Thanks for the great advice. I was really stressing over whether or not we could salvage the pour. Read a lot on failed SLC pours and I was nervous. Talked to my buddy so he could check the condition of the pour. Tap with hammer and listen for hollow sound, check for cracks in the pour. He said it sounded solid and no visible cracks. He will prime and we will pour the second layer later this week. Getting ready to do some Kerdi over the weekend.

Glad to hear it!

One last thing; make sure you pour within 24 hours of priming. You don’t want the primer to sit there for too long in between priming and pouring.
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Unread 04-07-2020, 01:10 PM   #8
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Holden, thanks for the info. What is minimum time between priming and pouring?
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Unread 04-07-2020, 06:18 PM   #9
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Holden, thanks for the info. What is minimum time between priming and pouring?

That will depend on the particular primer used. If Primer T; 2 to 5 hours.
If you’re using something else, let me know and I can get you the info for that particular primer.
Or check out the technical data sheet for the product you’re using on our app or MAPEI.us
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Unread 04-07-2020, 06:53 PM   #10
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If you've already primed, you can put another layer on prior to pouring the slc as long as you give it the minimum time to dry.
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