Depending on colour, and brand of paint, you'll need more than that.
I used 4L of Tractol yellow paint, and gave it about 2 coats all over. Going over 3 times on the higher contact areas like on the corners and that.
Some people thin the paint down with thinners/spirits to get a smooth finish. I lopped it on thick. It's got a really matte finish, like the walls in your home, but my God it's durable! Really good strong paint.
Think I paid about £20 for the tin of paint, and spent about a tenner on rollers (Used small 6" foam ones).
Get some 80grit emery cloth and go over the whole truck first to key it good for the paint.
