Self leveling mortar mix
 

what materials can I use to make my own self leveling material to apply over concrete. The floor is poured concrete and when cured is really uneven, I need to lay Vinyl flooring and need a level surface, thus needing a self leveling material to do so.

http://www.dap.com/images/products/104143_2001.jpg

There are many other brands out there, Armstrong is one I have used.
This stuff sets up quickly and is ready to cover in about an hour.

http://www.dap.com/product_details.aspx?product_id=119