RadonSeal Deep-Penetrating Concrete Sealer

I bought three 5 gallon buckets (one at a time) of this to seal my basement. I had planned just to do one area of floor and the walls with my first bucket but liked it so much I ended doing all walls and floors in my basement. I also used one bucket of Ion Bond Armor for the room I really wanted sealed and used the extra on the most damp walls after using this sealer. I had to remove a lot of old sealer paint and other stuff on the 60 year old walls. I bought the Bosch Concrete Surface Grinder and ground off all the stuff down to bare concrete before spraying the sealer. After spraying it pushed a lot of the white stuff back out. I bought the cleaner and planned to use it to clean the walls after sealing, but it did not work at all in my case. I spent a lot of time on the phone with Radon Seal and they were very helpful. You have to understand that every basement project is slightly different and there are unique snags. It seems in my case I waited too long to use the cleaner (only two weeks) but I may have had calcium carbonate form. I ended up just using the grinder to clean the walls. I highly recommend the Bosch Concrete Grinder but cannot recommend the Radon Seal Cleaner. After sealing and putting Ion Bond the floors are really well sealed. However, I was under the impression that it would leave the surface able to be painted but in my case water beads up and stays for more than an hour. I have been afraid to try to paint like this, but I am happy with the sealed concrete and may not need to paint. I tried to call Radon Seal to discuss painting after sealing but we must have got wires crossed since they did not return my call, which is unusual given the long phone calls I had with them previously. I will try to cal them again when I have time. All said, I would definitely recommend this sealer and the Ion Bond Armor as well as the Bosch Concrete Surface Grinder. I would not recommend the cleaner. I bought the crack filler foam kit but have not used it yet. One other thing, these guys have a very good web site with tons of information. They said that their main customer service problem is people who buy the stuff but do not go to the Radon Seal web site to read all the information before they start the project. You need to make sure the concrete is bare and will absorb water. I had a couple spots that I did not grind enough and when I said the sealer not soaking in I got the grinder out and went over that spot again and it went fine. You need to realize that doing this is a big project. Granted I had some pretty messy old walls to start with, but the grinding and prep work took a huge amount of time. I have been on the project nearly three months, most of the time grinding. However, putting the sealer on will take about 50 minutes a coat (two or three) plus waiting two or three hours then hosing and scrubbing to make sure there is not excess left clogging the surface. In my case I did this in stages and there were eight or ten days devoted to spraying the sealer since I had to move stuff around to be able to clear an area for working on. 11/27/2014 update. I painted two walls in my garage that were sealed with RadonSeal Plus and Ion Bond Armor. I used Behr Concrete and Masonry Paint (the one with no water proofing). I had been concerned about painting because the floor which was sealed the same way beads up water for many hours and I thought the paint might not sink in enough. The paint sent on well and after a month or two it seems to be holding up without any signs of lifting or pealing. I also have been able to patch some holes with epoxy enhanced patching concrete and it seems to attach well to the already sealed concrete walls and floors. The basement seems to be well sealed now. During the late summer I did not see a huge humidity drop and continued to run my dehumidifier. Without the dehumidifier it seemed to have about 55% RH, possibly due to air still coming in through my garage which under the house and part of the basement. I also have two sump pump pits with water in them that are not yet covered to block evaporation. In years past, without a dehumidifier, the labels peeled off of my wine bottles. Now, in the winter, the RH in the basement is less than the main floor, both with no dehumidifier. There is no sign of any moisture on the walls or eflourescence coming out of the concrete. All said, it was a huge amount of work but I am pleased with the result.

Does exactly as the description describes. I used this for the first time in 2006 in Long Island, NY, in our 1,200sqft basement, after being recommended the product from a friend who had used it 2 years previous. Their basement tested 40x over the recommended levels of radon!!! Not to mention, it flooded several times a year. Two weeks after application it tested well within safe levels at HALF the recommend level!!! Nor have they have any flooding in there since! Needless to say, I was sold, even though we had a brand new house, that tested within the safety range. We applied this to the basement for re-assurance. Super easy to apply. Looks like water, pours/sprays like water and is non-toxic. No bad smell and water clean-up. Doesn't get any easier than that! It's now 2012 and I have finished applying this to another house, the new basement beneath my 1875 miner's cabin. This area of Colorado is notorious for high radon emissions. Unfortunately, I don't have a 'before' reading because the cabin is not yet air tight, hence, I can't get an accurate reading. Once it is airtight in another month or so, I will take a reading and update this post. I'm 100% confident it will come up within the safe range even though my neighbors have had to install expensive, electric mitigation systems. Will keep you posted!

It was very easy to apply, after it dried for three day the floor felt like it had sand on it. I had to sweep the floor several time to remove all the dried material off before the next treatment. After the second coat the dried material reappeared in certain area. I used all but a gallon on half of the floor. For the price I do not feel this product was worth it!

I don’t understand why this product is peeling up from the floor. I’ve etched and mopped the concrete and still seeing this. Update: I didn’t realize that it needs to go on thick. Letting thin layers dry completely didn’t work for me. But it work and doesn’t peel up if I applied successive layers before the prior dried but after the first dried enough that it would run. I’ve revised my rating from 1 star to 4.

Does exactly what it says. Used throughout our formerly damp basement!

We had to work with customer service on our purchase and the team was great. Easy to use.

Used this as a last line of defense for radon mitigation after sealing the floors and walls in the basement with concrete. The pros are that this goes on and cleans up very easily by using a 1 gallon pump sprayer. The con is that it is thin. It will not seal small cracks as it's just not gelatinous enough. I used this for not just radon mitigation but for management of odor in the basement when replacing some carpeting. The approach I used was to repair all the cracks in the wall and floor with concrete. Then I followed up with 2 heavy coats of Radon Seal and then two coats of Kilz primer. I can't tell how well the radon seal worked, but after the 3 step approach, the basement was completely odorless. I can only guess that I reduced the (already low) levels of radon using the logic that if you can no longer smell any dirt-like odors, then the radon that was offgassing from those same dirt particles was reduced as well.

I got this to seal a 60 year old basement floor that was producing a lot of dust. The floor was very thirsty so a single 5 gallon bucket wasn't enough for a single coat. I got a second 5-gal and kept applying until the floor stopped absorbing it. That was about 6 months ago and the floor seems to be well sealed. The surface does indeed seem to have tightened up and hardened and it no longer sheds a discernable amount of dust. - Update - It's over a year since application and I'm very happy with the results. This product did change the surface to the concrete so that it's now tight and no longer sheds any dust. It isn't simply a coating. Instead it penetrates the surface layer and changes it.