I use latex often and I would disagree with that statement. It is definitely lighter than ppg and such. Roy mentions on his site he lost 4 and 1/12 pounds after repainting a 92 inch plane with latex. It is extremely thin when dry and very light, it also covers very well. I always use Sherwin Williams flat or satin for my warbirds and will use the same on my BVM sabre.
good luck
Paul