To be able to airbrush with masking successfull, you need good quality masking tape and an airbrush capable of very fine, misty spray at low air pressure. The objective is to prevent paint seeping under the masking or building up ridge after painting is done.
Assume a three color camo and the first color was painted over the whole model and masked. Start the a first coat using the same color of paint under the mask and let it dry. This will help prevent the second color from seeping under the tape. Apply the second color in multiple fine, misty layers. It helps prevent ridge. Let it thoroughly dry before masking for the third color.
So the three ingredients are (1) the right tools, (2) patience and (3) practices.
There are tricks for painting soft edge camo. Do a search to get those posts.
Just curious. Do you have a link to the Spray Can Single-Action Airbrush? Where did you get it?