Humco 272730001 Sodium Silicate Solution 30 oz, Shape

Will fix a cracked head on an engine

Sodium silicate better known as liquid glass arrived in a plastic jar wrapped in bubble wrap secure in a box I've read reviews about jar being broken so I was skeptical it's good to know that I can still get the product if needed. If you have a blown head gasket or a leak in your engine I suggest this over any other stop leak I've used it on a couple blown head gasket in the past & it works & didn't stop up my radiator or heater core

Product appears to be ok at first glance, but was almost a spilled mess , due to poor packaging. I'll give 5 star as I was going to repackage anyway but someone else might have been upset.

Works better than I imagined. It's like Scotch Guard for concrete.Edit: I ended up purchasing concrete sealer 100% sodium silicate for bulk projects, much cheaper.

We used this in a 1994 Mazda Navajo to repair the head gaskets and it worked. We had previously tried 2 other big name options but had to use this in the end. Worked so good I was able to sell the car (yes I disclosed that this was in it)

I applied this for a blown head gasket on a 2005 Nissan Altima there was antifreeze coming out of the spark plug Wells it fixed it in about 20 to 30 minutes it's been a little over two weeks and the car's been running fine no more water the head gasket got plugged up

Got it to repair my head gasket but it was too far gone.

It worked well again