I like the old looking signs with layers of paint. (hertoolbelt.com)
He then applies an approximately 1 / 8 - inch - thick layer of paint on another canvas of equal size, pressing them together and leaving them to «cure» overnight. (artsy.net)
However, I'm still confused with how to work... someone said start lean and build up with thicker layers of paint. (willkempartschool.com)