krem wrote:1k and acrylic are different, im not sure of the chemical make up differences, however I know that 1k and acrylic primers are different, I would imagine the paints will follow suit!!
1K means that the paint is a single component, air dry. So it does not have any hardener in it and dries by evaporation of the thinners used to carry it to the panel. What we refer to as acrylic here is all 1K but there are other 1K paints as well, enamels, for example.
krem wrote:you cant go 2k or 2pak over acrylic as you will get solvent pops, .
Untrue. As with any paint, the primer must be dry before overcoating. 1K acrylic automotive paints are 100% compatible with paints from a 2K system with only a very few exceptions like iso-free primers and clears. What neither are compatible with is enamels and other paints not intended for automotive use.
For example, I did a couple of panels on an MG-B recently. There was some minor rust to be repaired and I then used an epoxy primer for protection followed by a 2K urethane primer and then the acrylic topcoats to provide a 'period correct' finish that matched the rest of the car.
I often use 1K primer as a sealer/surfacer for small repairs or where there is still a cover over the metal.