Rainguard International CR-0701 Micro-Seal 1 gal Concentrate (Makes 10 gal) Professional Grade Water Repellent Sealer - Concrete, CMU, Block, Brick, Stucco, Stone, Wood Surfaces, Clear, Bottle

I have a 30 year old stone chimney that was leaking when it rained heavily. I had had a few issues in the past with it, and hired someone to attempt to fix it. A few months later I had problems again. I decided to take on the task myself. I spent a few hours filling any cracks I could find with "General Electric GE5020 Concrete and Masonry Silicone II Caulk." After that dried, I applied a good layer of this Rainguard Micro-seal with a hand sprayer. Finally I added a chimney cover to cover the flues. I have had no problems since. I cannot say for sure which product was the cure or maybe it was the combo, but I feel like they all added value.When it rains you can definitely see the water behave differently on treated and untreated areas, similar to how water reacts to a windshield that has been treated with Rainx. When it rains, no water sticks to the chimney or surrounding roof area that received some treatment, it is repelled and runs immediately down and off. I am very happy with the product.

Ive been in the masonry trade and have been in business for approx 30 years . Majority of my work is restoration,repair,preservation,preventive maintenance with a little twist of new... In other words honoring and preserving masonry. With that being said, i can't express enough on the importance of keeping all exterior masonry surfaces " WEATHER SEALED ".. it's a MUST not an option,the harsh weather of elements , the beating sun of summer and harsh freeze and thaw of winter takes its toll ... There are so many proven benefits of sealer protection thats it's a " no brainer " period... I have done extensive repair projects to old and newer masonry in which it could have been avoided had the existing masonry would of been treated with a siloxane / silane blend sealer such as ( micro-seal )..All raw masonry new or old needs sealed.. It really is the final step in completing a masonry project.. I have kept track of projects not to mention field tested sealer applications at my shop location.. Guess what ?? They are still repelling water 10 plus years later, still resisting water absorption.. concrete block,brick,natural stone, thin artificial stone veneer, stucco mortar parging and concrete surfaces..Now keep in mind prior to a sealing treatment the existing masonry needs to be in stable condition and any repairs need to be addressed accordingly using a proper method etc.. Many problem issues i have been seeing lately is with thin stone veneer.. Which its use for exterior of homes is on the rise , although thin stone has its advantages in the building industry it is very problematic .. they absorb alot of moisture therefore tend to pop off or debond during the winter freeze thaw cycles etc.. not to mention excessive water wicking into interior wall systems creating a whole other havoc with rott and mold etc..Man made thin stone can also fade due to uv rays and yes it does.. keeping it sealed helps prevent that problem.. Now onto older masonry, what can sealer do to help ?? ANSWER = preserve it.. remember brick are very absorbent as well. You can still have a brick home in excellent condition and still wick water into the home.. repeated rain can and will do this due to not having enough time to evaporate or simply " dry out ", not to mention there may not be any weep holes for drainage of excessive moisture or lets not forget interior airspace between wallsystem and masonry that build up condensation .. Now by sealing you prevent the exterior water intrusion.. Excessive condensation can be remedied by the installing of venting where needed etc..Now im sorry for the long rant but as you can see im a huge advocate for saving and protecting masonry. Be proactive and keep it sealed, i can guarantee you that if you ignore it, you will incur future costly repairs that could of been avoided !!Yours in masonry , Bryan J Mabius ( mabius masonry ) my profile: custom mason with over 30 plus years in the trade, trade industry rep,guest vocational masonry instructor,structural bridge inspector , consultant

We had a chimney that was spalling badly. Applied this stuff with a 1-gallon hand-pump sprayer and loved it. Applied easily and neatly.There was eventually some whitish build-up on the inside of the sprayer nozzle, which is probably to be expected with such a product. Once removed, the spray pattern was back to uniform and nice.Did not stain/yellow our old, recycled brick. It did, however, give a slightly darker, "newer" appearance to the treated area versus nearby, untreated areas. If you know what you're looking for, you can see that we treated the outside of our fireplace firebox all the way up to the chimney and "left" all of the surrounding brick untreated.Thinking of ordering in bulk and treating the rest of our brick before any of the existing spalling accelerates. Consider this aspect of "recycled brick" before you do the ecologically-conscious thing and build anything out of re-purposed materials!Good product - would recommend and will likely purchase again.

I applied this sealer on new broom finished concrete. The slab cured for 3 weeks prior to my application. Slope is 1/4" per foot. I applied 5 gallons of mixed concentrate on 704 sq ft - roughly 140 sq ft per gallon, which is consistent with the instructions on the bottle. For $400/gallon of concentrate, I was expecting exceptional results. I was disappointed that water did not readily bead up after a few days following the application. I contacted Rainguard, and they immediately responded to my request and sent me another quart of concentrate! Indeed, any sealant's effectiveness is heavily dependent on many factors. I recommend this product, as Rain Guard stands behind what they sell (and they should, for the price). I recommend an application rate of 1 gallon mixed per 75 sq ft for reasonably new, broom finish concrete. I've attached pictures of the half of my driveway that was coated once (140 sq ft per gallon), and the other that was coated twice (70 sq ft per gallon). Pics taken shortly after a rain.