As Dave rightly points out, expansion joints are required all the way through the flooring. Without them in the tiles, you're allowing stretching of the subfloor where a solid tiled layer is going to...
I think Stef just uses the buckets to mix in, I'd say that there's either weber set plus or Tilemaster standard set in that greenstar bucket, there's no way on earth he'd pay for a bucket so this is...
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