Ran out of Concrete Laying Slab for Summer House but What to do now?

[symbiosis]

Hi all
Laid a slab for the foundation of a log cabin summer house last weekend and unfortunately ran out of materials and daylight!!

The result being 1 1/2" under the shuttering and not the smoothest of finishes with some noticeable ripples.

What are my options, can pour another 1 1/2" of concrete on top or am I better off with a thin layer of self levelling compound on top?

Thanks

[Skid Sprocket]

! 1/2 ins is a bit thick for self leveling compound and a bit thin for a screed. One option would be to add a 1/2 ins strip of wood on top of the shuttering and then you might get away with a concrete screed (2 ins) of 3 sharp sand to 1 cement.