For simple wet lay that works fine.  You don't need to physically weigh it out if that's a bit awkward, just calculate it from the nominal weight of the cloth and surface area used.  eg a 200gsm cloth, 2sqm and 4 layers would need 1.6kg of resin plus a little extra for waste etc. 

If you do infusion, you can take into account resin uptake of the peel ply, mesh and bit for spiral and hoses.  You can also reduce the resin ratio to 60:40 fibre:resin as it is more efficient.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant