HARTLINE 10001 Rockite Expansion Cement 15 Min 1 Lb

Tried many times always with a good result. This product has been around for many decades. Fast and easy to use. Best concrete patch ever. Highly recommended by 50+ year builder.

I got this to fix a wobbly mailbox post (which seems to be a popular reason). I thought I had ruined things because I got the mix way too watery. I figured I would have to order more and try again, being more careful with the mixing. BUT a couple of hours after I had poured it around the post and set a pole to prop it up straight, it was solid as a rock.

Great stuff. Super easy to use. Sets up faster than I thought possible so it was perfect for shoring up my mailbox that had come loose over the years. I can't say enough good things about it.

This product worked well for me. No clear instruction for mixing. I used 4.5 oz water per AI, but came out very runny. But I used it anyway to see what happens. It took several hours to hardend. To my pleasant surprise, it worked! You may want to use less water for better result. See photos.

I needed a small amount of concrete to secure a railing. This worked great

This product would be good for an intricate hole or design in the ground because it is so thin. And it breaks easily if you are pouring only a thin coating.

This product is garbage. I tried to use it to anchor a flag pole sleeve and it did NOT expand whastover and after more than an hour of set time I was able to actually move the sleeve in its hole! It is cheap and i wanted to let people know why it is cheap.

A neighbor hit my mailbox/light post outside and it was tilting halfway over, filling it in with dirt was not enough to keep it upright. I choose this instead of concrete because it seemed less mess and hassle. It was, it's super easy to use and mix, and works perfect. My post wont budge now. I got a one gallon plastic water bottle to use as my mixing bowl, just cut the top part off. You need a throw away stirrer or spoon. You can make this as thick or runny as you want, there is no instructions. So add the powder first and slowly mix in water until desired consistency. I put 4 wooden wedges around the post and hammered them tight. Then I made half of the powder mix to be slightly runny but not too watery. I poured over the wedges and into the gaps. Let sit a few hours to harden. Then I mixed the other half and repeated the steps. I figured it was best to not have a really really deep pool that might soak into the ground before it all hardened. Now I will fill with dirt and hope no one else hits it :)