I purchased Shinagawa refractory mortar. It's an Australasian company and the product is in New Zealand. It came in a brown bag and I was surprised it didn't have instructions but I assume you just add water. I made it up quite runny at first and as soon as it was on the brick it started showing cracks in it. I then made up different consistencies to see if it made any difference but it didn't. All of my mortar cracked straight away. It's been very frustrating for me as I find the mixing of cement and mortar is very technical and I'm a girl so never did this stuff in cooking class. The guy that served me this stuff wasn't helpful. I even mentioned before I put it in car it didn't have any instructions on package and he gave me a blank look as it I was stupid. I just assume you add water and you're suppose to know this stuff.
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Shinagawa refractory Mortar Cracking problem