Concrete for a desktop, anyone done this or similar?

[norton]

Hi guys,

I'm looking to make a new desktop to sit on the singer sewing machine legs I'm currently using.





Problem is, I've never used concrete and I've no idea about the mix ratios. There's plenty of premixed concretes and mix ratio info about however these are for building houses etc. They appear to use coarse aggregates which could show through the surface of the concrete however I'm after a smooth slate like finish and no idea what type of mix would achieve this.

Help!