i go against normal beliefs here, i have had too many pumps that did not work right, always the hardener pump. i use measured cups, the normal ones you see everywhere. it is easy enough to add 5 ozs resin, then one oz hardener, then mix real well pour out of cup in to something that will allow the resin to spread out more like a pie pan. the reason i use the pie pan is if you leave the resin in the cup and its a tall column it can heat it self up and start setting faster.
use the pumps but check the calibration by using the measured cups, then pour out in to a thinner layer after mixing