You need to work out / roughly calculate the surface area you want to cover with the primer.  Then work it out from the amounts in the info on the EC pattern Coat primer ..

I think you will need about 1 kg of it pr. roughly 0,7 sq metre ..   But that is not taking into account of sanding down, flattening and applying multiple coats.

Depending on the amount of catalyst you put in and your workshop temperature, be aware that it "sets" very abruptly-  My advise is to work fast and stop brushing as soon as you notice it thickening.

Good Luck!

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