[dclynch]

In some modern commercial construction, I've seen something that looks like caulk instead of mortar at some large joints. I need to replace the mortar on my front porch bluestone steps and was interested in trying this instead of traditional mortar. Does anyone know what this material is?

[RickJ]

I've seen and used that stuff but can't remember what it's called. I do know this, though: You don't want to use it as a replacement for mortar. The purposes for mortar vs. that stuff are different. Stick with mortar for your porch steps.