High Heat Fire Resistant Mortar, 10 Oz, Black (7079818854)

Worked just like real mortar only it doesn’t crack and it’s in a caulk tube

Good value, it dries in an okay time like 2 or 3 days I think, as for crack resistant, we'll have to see because sometimes I have to do this every year. So far there are no cracks from this year's use. It seals well but wear gloves. I had to use my finger to make it go into the cracks well. Texture is smooth and sticky.

I like this stuff cause it works and is easy to apply.

I recently purchased a 37 year old house with a fireplace that was in need of repair. I received a quote to repair the cracks from the provider who cleaned the flue, and it was going to cost around $200. I purchased 2 containers of this DAP mortar and did the repairs myself. I only ended up using 1 container, which went further than I expected. It is pretty much like working with any other tube of caulk. Many of the cracks were fairly narrow, so I only clipped a small amount of the end off, so that I would be able to fill in those narrow cracks. It was fairly messy, though I am not very skilled with apply caulk, so that was to be expected. It dried fairly quickly and I was able to start a low burning fire (i.e. 2 small logs) within 2 hours after applying the mortar. The color of the mortar is black, and as far as I can tell, the color doesn't change. We plan to paint the inside of the fireplace black, so it is not an issue for us, but otherwise, the color might be an issue for some. I've included some before and after pics, showing the cracks before the repair and the black mortar after the repair.

This works fantastic for my purpose. In my basement is a woodstove with one of those god-awful chimneys that has all the segmented sections that let’s air in to create creosote or in the summer if it reverses it let’s smoke smell out. After I took it apart and cleaned it thoroughly I put this stuff on each section as I was putting it back together. Keep a bunch of wet paper towels are wet rags handy as you wipe excess off with your fingers as you go. I’d say in 15 to 20 minutes it was semi hard. Then I just started a fire to fire the material. I have no smoke smell anymore. The draft is stronger to because there’s not air leakage. Over the next few days of having fires the excess that I didn’t quite wipe off or crack and fall to the ground but the stuff in the joints is staying strong. It’s not the prettiest up close but when you’re not standing right next to it you really don’t notice it. it dries to a very dark charcoal gray almost black. If I’ve gone slower I could’ve made it much less messy. It shows up more in the picture than it does in real life. You could definitely paint it with grill paint if you want to do afterwards. A+, five stars, two thumbs up, would play with grey fire smoo again!

worked very well. I used it to seal joints on a wood stove pipe. After applying it appeared to flow into the seam creating a good seal. Wish they made it in a smaller tube, I have a lot left over.

These went on easy enough to close a small gap in the pipe that attaches to my wood stove but even though I followed the directions and let it cure before building a fire, I have found some of the mortar has dried and flaked off leaving a fee pinholes around the pipe. I will reapply in the summer when I can leave it to cure for a few weeks instead of a few days and see if that helps. It did go on fairly smoothly and the black color blended in well with the pipe but if it doesn't hold up to the high heat it wont be worth the money.

Good product but bad US postal shipping

Comes out a little runny but has held up well and works on the cracks in our chimney. I “v’d” the cracks to get better adhesion and all is good.

Worked great for me.

Used this to repair some minor cracks and a few small broken areas of mortar in my fireplaces. It is a bit sticky, sometimes preferring to stick to the tube and to fingers rather than to the mortar, thus it was a bit more difficult to apply than I had expected. However, overall it has stayed solidly in place after several fires in the fireplace, and it looks good.

Worked well for what I wanted. I needed to seal between the bottom metal edge of my fireplace grate and the irregular surface of the stone hearth. I was expecting that it would be firmer out of the tube and hold its shape better. I needed to tape off what I needed and let the product dry, which it did quickly. It has hardened now and fills my gaps very well.

Followed the instructions perfectly but the seal gave away just after two days.