Masonry Crack & Joint Sealant

Easy to apply and VERY effective

Excellent sealer for ceiling mortar cracks.

Excellent product! I patched a good sized corner chip which came off the concrete chimney cap. It's been ~3 years since the patch and coating, and it's still holding strong. Rare to find a product which works as promised, but I've got to give this stuff/company credit for it living up to the claim.

Worked really well to temporarily seal our chimney to stop leaks

Saved me thousands in repairs to the chimney. Noticed that the chimney was wet in the attic area and had a drip inside of the fireplace. Was very concerned and called around to multiple repair men and was qouted well above $1000 to repair it. I did the repairs myself in multiple stages. This was about stage three when I discovered some cracks. Applied this to the chimney and boom all problems disappered. I will tell you this doing it yourself and ensuring that you have the right product for the right problem is key.

Easy to apply with a paintbrush, texture was much like elmer's glue, but dried yellow with bubbles; would not buy again as it didn't fill in the cracks long term- 1 week after application the material had dissolved, even with the Chimney RX waterproofer applied after.

Used on a brick chimney. Some cracks between brick and mortar were up to 1/16" wide, none larger that that. For the 1/16 inch cracks, I had to apply 3 coats to get the product to span 1/16" which is 1/2 of what product claims to be able to fill. I tried to apply extra heavy to prevent reapplication need and could not get product to fill perfectly on first attempt no matter the application. As a contractor labor was more costly than the product, so as such I was disappointed in this aspect of the product. Besides the above comment, estimated coverage was accurate as per Mfr. info provided, workability was good and I applied on a warm summer day, and all cured as per Mfr. literature.....some clear....some whitish depending upon thickness applied. This chimney did not have any major water leaks before, so cannot testify to efficacy of the product....this was the best engineered product I could find as it remains breathable....nothing of this type was for sale at local brickyards or home centers. End of day I think worth spending time to apply 3 coats of a breathable product where needed....just wish I knew this in advance to better estimate job labor costs involved. Found a toothbrush to be the best applicator tool vs. traditional paint brush types as the many short stiff bristles held more product minimizing having to dip as often....yet not so large as to waste product on areas not needing crack fill.

Great product are use the whole chimney Rx system to waterproof my very problematic brick chimney... This was just part of the process and all combined the system is excellent