I used to paint stuff when I worked for ICI Paints at Slough both automotive and decorative. It doesn't matter how good the paint is that you are using if your preparation has been poor or non-existant. British car makers never bothered much with steel pre-treatment or finishes hence British Leyland cars were rotting by their first MOT. German cars of the same era were treated differently hence they outlasted them. A good rust and grease free surface to spray onto is the first step with the correct undercoat/primer for the colour/top coat you are using. In lab conditions, under which I worked, the paint, spraygun, panel and spraybooth had to be kept at 25C so that you got consistency or at least one less variable. Light coats with plenty of drying time and patience is probably the key to a good finish. Try and go for consistent conditions everytime and don't rush it.
I used to paint stuff when I worked for ICI Paints at Slough both automotive and decorative. It doesn't matter how good the paint is that you are using if your preparation has been poor or non-existant. British car makers never bothered much with steel pre-treatment or finishes hence British Leyland cars were rotting by their first MOT. German cars of the same era were treated differently hence they outlasted them. A good rust and grease free surface to spray onto is the first step with the correct undercoat/primer for the colour/top coat you are using. In lab conditions, under which I worked, the paint, spraygun, panel and spraybooth had to be kept at 25C so that you got consistency or at least one less variable. Light coats with plenty of drying time and patience is probably the key to a good finish. Try and go for consistent conditions everytime and don't rush it.