Just don’t buy it from a builders merchants they have no idea how to store anything, if you do chances are it will end up like the original job here,
Wow, looks great! Did you need to trowel it? Or just pour and spike roller?
Mix it mechanically on a slow speed, mixing from the point you slowly add the powder.
Keep a small handful of powder back from the mix as this makes it slightly more watery and helps with flow.
Clean the mixing buckets every 2nd mix otherwise it ends up too thick.
Pour the mix away from the edges and help it towards the corners with a trowel, don’t play around with it too much.
Use the spiked roller to get the air out and flatten the different pours together.
Simples!!