Curious- base coat vs acrylic urehane for base

It really depends on the base coat you choose. For example, I would say that is no way near enough if using OmniBase which tends to be watery and more transparent but if you are using Sikkens, that is probably fine although I would personally rather have too much than too little and wouldn't chance it for the difference in price versus getting that extra quart. If you end up using a value line, best bet is to have a gallon mixed since it usually costs about the same as 3 quarts anyways