Posh git, what's wrong with a squirt of Fairy liquid....a faux pas. Needed to render the narrowest strip in the garage. Won't be plastered, probably will paint it though. I'd run out of my normal admix. However...there's been a 5L container of this stuff kicking around here either since I bought the place or that I scored from work. It still sounded liquid when I shook it...
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Mixed it up 1:1. Used it to wet a mortar mix 3:1:1, builders, opc, lime.
The stuff smelt like the worst wee ever and working time wasn't good. It's cracked. Probably didn't help the cement was old.
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Only used half the dry mix so I've bagged the rest and will mix up tomorrow and try and get an acceptable top coat.
I put high density insulated wriggly tin covered in plastisol on my garage roof and added a 4x3 beam at the top end to get a bit more slope with another cut to dimensions in the middle .Flattish roofs are a total PIA . I'd offer you'll need a 3 in 80 drop along the length at least .