I am ready to put on PPG DP50LV epoxy primer on the bottom of the floor while I have the cab sitting on the cowl. I was thinking I could just brush it on since I will be putting undercoat on top of the primer. I am thinking that since I am not spraying I won't need reducer. I read some posts on line about giving it lots of drying time since it's going on thicker. Any thoughts on this?

A day without laughter is a day wasted- Charlie Chaplin
When wrestling a grizzly bear, you have to keep at it until the bear gets tired, not when you get tired.
1948 Chevy 2-Ton