Herr Dr. Professor wrote:"I am no so ashamed of it'" Darn right! It's lookin' good to me.
As to thinning paint to the consistency of milk (I have also read "2% milk"), I have heard this advice in the mid-1970s, but I could never figure out how to compare paint with milk. Maybe I should thin a paint for spraying, drink some milk, and then drink some of the paint. That way, I'll never have to worry about it again.
Lets agree never to talk about the indecent were I was painting with the white paint for the lettering!