Q: I picked up the materials for the high temp mortar mix and they give me plastic cement instead of Portland cement. Can I use this or should I take it back and get Portland cement.
A: Wow! Way Wrong Stuff!
Had to look that stuff up – It’s for making Stucco.
Yes – plz take it back and get Portland Cement.
It’s very, very, very common – every HD / Lowes in America sells it.