Spray gun assemblies, methods and systems for applying coating with plural components

A method for applying a coating with plural components, the method comprising:

• receiving compressed air at an atomizing air flow path and a fan air flow path of a spray gun assembly;
• receiving a colloidal flow of a colloidal suspension component of the coating via gravity feed at a colloidal feed inlet of the spray gun assembly;
• receiving a catalyst flow of a catalyst component of the coating at a catalyst feed inlet of the spray gun assembly;
• routing the colloidal flow to the atomizing air flow path of the spray gun assembly;
• initiating atomization of the colloidal suspension component in response to the compressed air flowing through the atomizing air flow path;
• routing the colloidal suspension component, in at least partially atomized form, to a main atomizing outlet in a nozzle of the spray gun assembly in response to the compressed air flowing through the atomizing air flow path;
• routing the compressed air flowing in the fan air flow path to a fan air outlet of the nozzle;
• routing the catalyst flow to a catalyst outlet of the spray gun assembly proximate the fan air outlet of the nozzle;
• continuing atomization of the colloidal suspension after exiting the main atomizing outlet in response to the compressed air flowing out the main atomizing outlet of the nozzle;
• atomizing the catalyst component after exiting the fan air outlet and in response to compressed air flowing through the fan air flow path and out the fan air outlet of the nozzle;
• and
• mixing the catalyst component, in atomized form, with the colloidal suspension component, in atomized form, while in flight from the spray gun assembly to a target substrate.

A system for applying a coating with plural components, the system comprising:

• a gravity feed container configured to hold a colloidal suspension component of the coating;
• a pressurized feed container configured to hold a catalyst component of the coating;
• and
• a spray gun assembly configured to apply the coating with the plural components to a target substrate, the spray gun assembly comprising:
• a nozzle with a main atomizing outlet and a fan air outlet;
• a main pneumatic inlet configured to receive compressed air from a compressed air source;
• an atomizing air flow path between the main pneumatic inlet and the main atomizing outlet of the nozzle;
• a fan air flow path between the main pneumatic inlet and the fan air outlet of the nozzle;
• a colloidal feed inlet in fluid communication with a gravity feed container and configured to receive the colloidal suspension component from the gravity feed container;
• an internal atomizing outlet in fluid communication with the colloidal feed inlet and the atomizing air flow path proximate the nozzle;
• a pressurized feed inlet in fluid communication with a pressurized feed container and configured to receive the catalyst component from the pressurized feed container;
• and
• a catalyst outlet in fluid communication with the pressurized feed inlet and the fan air flow path proximate the nozzle.