RE: Warbird Colors paint
I am surprised Chuck usually sends plenty of X linker for the amount of paint one of the small bottles of linker should do a quart of paint easily.
when I cut the top off the bottle I use a small pin in the top so there is a really small hole in the dropper.
one thing I found is if you over catalyze the paint it can do some funky stuff kind of orange peel texture and is hard to spray, kind of gums up with a little less it flows better through my spray gun,