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Sealing our White Concrete Countertops

September 17, 2015  —  Written by Julia Marcum 

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Definitely one of the most popular projects of our kitchen renovation so far has been our DIY white concrete countertops. You can read the whole post here (if you scroll down to the bottom of that post, Z Counterform has even offered up a discount code to our readers after the post went live).

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There was one final, very important step after that post and that was sealing the counters. These countertops staining or not holding up has been a concern for a lot of you (which we so appreciate!), but rest assured we researched the heck out of sealers before we even settled on this countertop idea. The sealer can truly make or break concrete countertops and we were looking for something food safe and virtually indestructible. After going through a dozen options, we felt confident going through with Preston’s top recommendation, even though it was the most expensive.

We purchased Stonelok’s E3-2k Countertop Kit in Low Gloss from VSeal Concrete Sealer for just over $200. But the protection it provides is really unmatchable. It has the highest chemical and abrasion resistance of any topical coating system , is food safe, has unmatched stain resistance against coffee, wine, soda, vinegar, citrus, Tabasco, acetone, gasoline, Clorox (and more), unbeaten abrasion resistance, and 400 degree heat resistance–they said a lit cigarette wouldn’t even harm it!  Here’s a video that we found on Youtube the demonstrates its durability:

One thing it doesn’t necessarily protect against is sharp knives cutting into it. In the video you can see them taking a utility knife to it and it leaving scratches. This didn’t deter us because cutting on any sort of stone dulls your knives (Chris and his knives forever!) so we’ve always used cutting boards in our home.

To begin the sealing process, we waited a full week for the poured countertops to cure. While they were smooth, they were chalky to the touch. We taped off the backsplash and around the sink and mixed the first solution following instructions that came with it–lots of shaking for x amount of minutes, waiting x amount of minutes, shaking again and then finally rolling it on.

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The first step in the sealer process “E3” was an epoxy resin and they sent us a high gloss even though we ordered a low gloss finish. Preston assured us that only the final coat, the “2K”, would really matter and as much as I worried–he was right. We picked up a “mirror finish” Purdy roller to apply both steps so we could get the smoothest finish possible.

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The sealer did darken the countertops very slightly (you can barely see the line between sealed and unsealed in the photo above) but Chris and I both actually prefer the more peppered look–photos of that at the end of the post. Once the first step was rolled on, we removed all the tape which is very important or that will  get sealed on too. ;)

You have to wait at least 12 hours before applying the second step. Preston came over the following day, taped everything off again and started mixing the “2K” which is a polyurethane resin.

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Although there is a lot of wait time in between, the actual rolling doesn’t take more than 30 minutes. Preston rolled the tops (of course) and all the sides making sure there were no harsh roller marks as he went. Because both the E3 and 2k systems are AB (meaning you mix two bottles together, a lot like you would hair dye) to create the solution, there is a window of time they must be used in. It’s a generous amount of time to get the job done, but you can’t really save any to use again if that makes sense.

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After sealing, the countertops have to cure 6 days before they can get any water on them. They were dry to the touch the next day and we were able to cover them with rosin paper after day 3 to install our sconces above them, but we waited to install our faucet and really go to town with them until after the 6 days.

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These countertops have our hearts. They now have a smooth, satiny finish that will stand up to almost anything. When we first approached Preston about doing concrete countertops, he asked us if we had any concerns or what we envisioned the end product to be. I said it was very important to me that the finished countertops be cool to the touch, a characteristic of stone that you just don’t get with countertops like laminate or some manufactured stone. Not only have these exceeded our expectations in every other way, now that they are sealed they are cool to the touch and everyone that has come over has been blown away to learn they are concrete. We’ll be sure to keep you posted in the coming months and years how they wear, and in the coming days how they look in the final kitchen reveal. :)

UPDATE: SEE HOW THEY LOOK IN THE FINAL KITCHEN HERE.

We wanted to give a shout out to our friend and favorite musician, Preston Pugmire, who truly made these countertops a success. You can check out more of his work through his Custom Concrete Finishing Facebook page and if you’re local, by all means, you will find no one better and more detail oriented for your custom concrete job. Also, we have an exciting update on their home for you in the coming weeks!

What do you think?

  1. Mariah says:

    Gorgeous work!

    I’m considering white &gold concrete countertops, so I have to ask, how have these held up over the years? Any problems?

  2. Shaun Epps says:

    Can’t wait to try this!!

  3. Lindsay says:

    Which sealer would you have used to reseal your concrete counter tops? We are in the process of choosing a sealer for ours but are finding it hard to locate good testimonials. Your opinion is much appreciated! Thank you!

  4. Katie says:

    What color grout did you guys use on the white tile?

  5. Mattie says:

    I plan on using your line of Dusk semihandmade cabinet lowers in my new kitchen, with these countertops and white upper cabinets, so very excited!!! I am nervous however for attaching the cement board to the ikea cabinet bases. How well did your plywood attach to the cabinets, in particular the front metal brace?

  6. Tiffany george says:

    Me and my husband are thinking about pouring white concrete counter tops. How have your held up?? Would you do it again?

  7. Amber George says:

    Have your counters remained white over the years ? Have they tinted yellow at all?

  8. Curtis B says:

    What grit did you sand the counters prior to sealing? Were they pretty smooth prior to the sealer?

    • Chris says:

      We used a lower grit to start and a finer grit to finish. The exact numbers I don’t recall, but it was fairly smooth, accounting for natural roughness of concrete.

  9. Gabriel Black says:

    Did you use the o-s concentrate substrate conditioner or just the “E3”? Don’t know if I need to use that small bottle or not. Than

  10. Marci says:

    Do you have a close up of your counters of the “peppered” look? Did you use only the white concrete or add the extra white colour packages that they sell as well? Great details on the process!

  11. Blake says:

    I was wondering if you had any small rough spots before the sealer, and if the sealer helped smooth them out? I just finished pouring mine and have been sanding for a couple of days and there are a couple of spots that I just can’t get smooth. I was looking at this sealer and was hoping since it was an epoxy, it would help smooth it out.

    BTW, your article has been so helpful in the process and I really like how yours turned out!

    • Chris says:

      Actually, we still have some moderately rough parts. Rough is a strong word, but it’s not glassy, like stone. It’s probably similar to how yours is. The sealer helps make it less scratchy, but it’s still a little rough and honestly it has never bothered me. We just embraced it as part part of the result.

      I hope that at least helps ease your mind! I was a little surprised with the patches at first, but have found it hasn’t impacted my joy of them at all.

  12. Nancy says:

    Hello,
    Enjoyed your informative article. Now, two years later are you still happy with your concrete counters? I have wanted them for 10 years and now that we are building a new house it’s time! I have heard horror stories about concrete staining, chipping, getting hairline cracks, etc and wonder if this has happened over the last two years. After researching quartz and quartzite and soapstone counters, seems they, too stain!

  13. Ty Goodman says:

    Any idea how the epoxy responds to a hot pot?

  14. Ginger says:

    How are your countertops holding up now? Did you end up re-sealing them over the Summer? We are in the process of pouring ours right now…and will be using the same sealer.

  15. Terri says:

    quick question – how did you prep the counter tops for sealing?

  16. brian mcalister says:

    It appears that the link to the stone lock sealer is broken. Do you have a link to the sealer?

    • Julia says:

      It’s called Stonelok’s E3-2k Countertop Kit. Maybe google around for the best price or to see if anyone else sells it?

  17. Christina says:

    I don’t see responses to several questions above which is a bummer b/c yours is the blog we first discovered Z counterforms and DIYing the countertops last fall. Any updates on the counters/sealant? Are you still as happy? We built a home and 6 months later still have plywood counters b/c I am tired! We did so much on this home. Finally ready to take the plunge and planning on Z forms, etc., but want to know if you are still happy or if you have any updated/changed insights on the process or products you used? Thanks in advance if you are able to drop a quick reply.

  18. Stephanie says:

    I absolutely LOVE how your countertops turned out. Your post helped me convince my husband to pull the trigger on concrete for our kitchen counters :) I have a couple questions about the sealer you chose. I see that it comes in a few different sheen options, and that you went with the xtra low gloss. I would like ours to be as matte as possible while still having a good layer of protection. Are you happy with the appearance of the xtra low gloss? Secondly, did you apply more than one coat of the sealer? Our counters are almost exactly 40 sqft, so I’m wondering if we could get away with the smaller bottle of sealer or if we should go ahead with the larger. Any advice would be much appreciated! Love your blog :)

  19. Karen says:

    I think we are going to bite and install these countertops. After watching all the vids I could find and seeing your final results, we are sold. On the sealer test video, the knife scratches which seems so weird (I mean muriatic acid?? And no key scratches???). Do you know if there is a repair for knife scratches?

    • Julia says:

      Chris is die hard about his knives so he would never cut on the countertops anyway (it dulls them) but I’m not sure about a repair.

  20. Cori says:

    Will you need to reseal the counter every year or anything like that? I’m trying to decide if I want concrete countertops but I want to make sure long term maintenance isn’t too costly. Thanks!

    • Britni says:

      I’m also wondering about reselling. Out of all of the blogs I’ve read, the sealer you chose seems to be the best. How often have you had to reseal? Or is it not necessary with the type of sealant you chose? Also, did you wax the countertops after sealing. Thanks ….and I absolutely LOVE your kitchen

      • Lindsay says:

        I, too, would like to know about resealing for these countertops. Julia, what are your plans for future maintenance?

      • Julia says:

        I’m not remembering exactly how often the sealer needs redone, but we’re probably going to reseal ours later this summer. In a couple places near the sink, the sealer has chipped. No damage has been done to the countertop, which is great, but when it gets wet (again, right by the sink) the concrete darkens until dry so we want to stay ahead of the game there. Hopefully, we won’t have to do it every year, but we’ll keep you posted.

  21. Tara says:

    Wow!!! Looks great.

  22. Megan says:

    Your kitchen is looking soooooo good!!

  23. Megan says:

    Your countertops (and entire kitchen) are beautiful! Love it so much. :) My husband and I are working on re-doing our fixer-upper, and I’m getting so much inspiration from you!

    -Megan
    http://www.lifeonshadylane.com

  24. Michelle says:

    I was totally skeptical about these countertops. I am blown away. They look amazing-as does the rest of the kitchen.

  25. Jadie says:

    Man they look amazing. I’m very curious how the overall expense compares to other options!
    PS I haven’t followed a renovation this closely in a long time, ha!

  26. Jocelyne says:

    Looks great guys. I agree the video was fun. My curious eyes might see that the shelf brackets are white now? Or is that trick photography?

  27. It looks amazing guys! And that video was fun to watch :)

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