What is the space - Square meters - which can be covered when using one kilo of epoxy material ( For one face) ?

hello sir,

space 

* a continuous area or expanse that is free, available, or unoccupied.

* The dimensions of height, depth, and width within which all things exist and move.

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3 mtr length and 4 mtr width a floor we can say this 12 square meter.

one side 1 mtr width 1 mtr depth  = 1m2

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1 Litre of epoxy resin will cover 1 square metre of area at 1mm of thickness.

A safe rule of thumb is to allow around 1.2Kg of epoxy resin per 1 square meter at a coverage of 1mm depth.