RadonSeal Plus Deep-Penetrating Concrete Protectant Sealer, Reduces Basement Moisture & Radon Gas, Strengthens Concrete, Outdoor/Indoor, Paintable - 5 Gals

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

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.

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.

Updated: After 3 months redone level is same as before, it's effect only lasted for a month or so. It wotk great for Radon reduction however coverage is false, as per customer support & discrption for 1000sqft should be enough to cover both floor & wall with 5 gallon, however applied 10 Gallon and it hardly covered 1000 sqft single coat. Very disappointed with the price & coverage

Great Product, it works as described. make sure you clear out all your stuff from walls and floors to make it easier to apply. It's literally as simple as spraying water, just get a pump sprayer (not a used one with bug chemicals in it), use the sprayer to dampen the floor/wall with water, then use the sprayer to coat the floor/walls with radon seal, before it drys recoat with radonseal again....easy! My basement was floating around 13+ for Radon measure by an electronic radon meter, I applied the radon seal and vented the basement for over a week and used a dehumidifier to get the moisture out and help dry. After I closed the basement back up I'm now around 8 for radon, but the high levels I'm sure are because I still need to cover my sump pump pit which has open dirt around it and my radon tubes don't have fans yet, so I still have some work to do but the area where my carpet is at and the exposed walls I feel i don't have to worry about since I put radon seal down before they installed the floor.

The sealer seemed to work well. I guess i dont really know as you cant see it, but it did expel salts and/or lime as it cured. So I assume it did something. Need to follow up with the Ion Bond Armour as they suggest. But one thing is for sure, the customer service is outstanding. I called a few times over the prior month just to be sure i was prepping the wall and preparing myself to do the job. Each time the guy I spoke with spent time going over everything. And never once seemed put out by it. Really appreciated that effort.

We built a new house with a basement and wanted to include carpeting below ground level, but water is always an issue. We used a combination of RadonSeal on the walls and Ion-Bond on the floors. After over a year there are no leaks and the basement is very dry and I couldn't be happier especially since the basement was a real stressor in our construction plans. Even just a few days after application it was obvious that this stuff was working great. Any water sprayed on the surface immediately beaded up and did not penetrate into the concrete. We did a lot of testing to see if there were leaks after the first application and did find a few which we sealed up and reapplied a second coat of the RadonSeal (to be clear the leaks were caused by gaps in the grout, not the RadonSeal). With the problem solved everything was tight and so far after a year totally water proof. This material seems a little on the expensive side, but it is really effective. I have tried a few other methods and I don't think you are likely to find a better product on the market for basement sealing.

They charge you for 5 gallons of product and only receive 3.25 gallons in a 5 gallon bucket so they over charge you for the amount you get you are better off buying in gallon jugs. The product itself seem to be a quality product and easy to apply with a sprayer.