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I'm installing large-format tile for a shower wall. I've installed the cement backer board and I'm ready to tape/mortar the joints. Everything I've read says to use thinset for this. But I have a polymer-modified medium set, since that's what the large format tile requires. Any reason I can't use this for the joints? I don't want to buy a bag of thinset just for the scant amount the joints require.

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Yes, this is fine to use. Most any polymer modified medium set mortar is actually a thinset. It is just heavier bodied than "regular" thinset and used for greater support and stability on larger tiles.

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