That didnt go well!

i'm no expert, but primers are thick, maybe the age makes it thicker too?? but I would guess ya need like the 1.8 tip desert rat suggested.....
also be sure to use strainer. helps to set the can upside down overnight, seems to help get the thick stuff off the bottom!!????
if its a hybrid epoxy, some I use,, say spray it will activator for primer, but add alittle reducer for use as a sealer. will flow better with little reducer..
body guys used to have guns for primer only too. I guess they still do??