LastiSeal Brick & Concrete Sealer 2.5-gal – Flat Finish. Waterproofs & Strengthens Brick, Concrete, Pavers. Interior/Exterior.

I applied this to very old patio bricks, and it has actually helped divert rain runoff to a center drain. The applied matte finish it is undetectable from bare brick. It’s not magic, but if you have good drainage already, this helps prevent mildew/algae and keeps water out of porous brick. It also seems to help wash soil and other debris away. When applied and allowed to dry, it is hard to tell the difference between treated and untreated surface, so you need to mark where you start and stop if you do not do the whole thing in one pass. It is super easy to apply if you use a $20 garden sprayer and wash the sprayer out between applications.

Sealed the stone behind and under my wood stove with 2 coats. Had enough left for my son in law to do their stone fireplace surround. Made the white stone nice and smooth with no discoloration and sealed the grout.

Seals great!

We enclosed a covered 21'x14' open patio with a 2ft high brick\mortar wall and 6' tall weather proof vinyl windows, creating a wonderful Sun Room addition. Our concern for weather penetration through the double brick wall and mortar was confirmed with the first heavy rain storm. Although there was no standing water intrusion, the very porous clay bricks\mortar quickly acted like a dry sponge and dampened the now living space interior of the sun room's masonry window foundation...not good.After doing extensive on-line research, I came upon the RadonSeal products and quickly identified their polyester polymer based "LastiSeal" Brick and Masonry Sealer as what we needed to block any moisture\rain intrusions. After speaking with Craig at RadonSeal, he confirmed that their LastiSeal product would be a great solution to our sun room's moisture issues. As weather became optimum (but winds were strong), I choose to apply the treatments with a brush (very easy and simple). Our bricks and mortar are so porous, the first treatment soaked in with the surface dry-to-the-touch in 5 minutes! As per directions, 24 hours later I reapplied (again with brush) and the second application took 2 hours for surface to dry. Through all of the applications and once dry to the touch, the brick\mortar surfaces returned to their original colors, again matching our home's brick-veneer facade! Two days after the 2nd application and again twice in the past 3 weeks, thunderstorms soaked the brick\mortar exterior walls of the sun room with absolutely NO moisture intrusion into the interior...WOW! We really love our new sun room addition and understanding that LastiSeal never needs reapplying, I can unequivocally state, "LastiSeal is Worth Every Penny"!!! Ted

I bought this after reading the description on this, hoping it would repel water like an old product I used years ago, called Thoroclear Special. I applied this concoction EXACTLY as the directions stated, doing it early in the morning, avoiding applying it in the heat, and hot sun. It dried fairly quick. It dried for 24 hours, or more, before it rained on the stone veneer wall, and sidewalk. I didn't repel water at all..!! I then put a second coat on the same area, and it dried 72 hours before the rain came again. After a second application, I thought it would repel water, but, it certain areas, it did nothing. Others, it repelled a little, but the veneer, and the sidewalk,still darkened from the moisture. For the price, this product was useless. I wasted my time and effort applying it. I will look for something else. I would NOT recommend this product..!

I live in the mountains where we have a fairly decent winter/ freason temperatures which can ruin concrete by allowing water to enter it and then freeze and crack the concrete. I pressure wash several properties and then come back a day or two when the cement is dry and spray this product onto the concrete with a pump up sprayer and it seals great until next spring

If you’re in the line of work of brick sealing concrete block sealing, or any thing of that nature this is the product for you. If you’re not using this, what are you doing? This product, it's extraordinary extravagant, marvelous, magnificent. It’s by far the best brick sealant I’ve ever used. It helps stop wind driven rain from penetrating brick/block. Helps preventing brick pitting. Paint bonds to it. It extends the life of some paints. (Except latex). It comes in satin or flat. I recommend it. 💯

We put it on during the month of November. Drying temps in directions indicated 40-100 F were OK with 70-90 ideal. Deck faces south. Temp of concrete deck on 40 degree morning was about 50 degrees. We put it on about 9:00 AM. By 5:00 AM the deck temp was about 75 degrees. Overnight the air temp fell to about 40. The next morning it looked fine. That process has repeated several times without effective change. Stone still looks fine. Stone (not very porous) got a deeper richer color. I was concerned about that thinking it may not bond well with the stone, asked their tech support if I should use the product on that stone and got a very prompt response that it would be fine. The cement joints (very porous) became more grey than white. My wife (the chief architect) has since repeated the process with other stone and it appears to be working the same. I only gave it a 4 star because I don't know how it holds up over time. We used a garden sprayer to apply and that worked well since the sprayer cleaned up with water. We applied, per directions to cover well. We bought the container that held 2.5 gallons. We had to cover about 300 SF. We may be a little short since we won't be able to cover the back deck until after winter (I store firewood there). So far so good.