Hello Southpaw52,
If I remember correctly the recommended method is to tack the first color down with a 2 second press, hot peel the carrier, repeat as necessary, then apply the final color and press for the full duration. This is said to prevent shrinkage of the lower layers that might impact on the positioning of the final layer. Also this prevents exposing the first layer to multiple full application temps and times. If you are using the Stahl's vinyl I would contact them at their support number and ask for clarification. It seems to me that in the videos they indicated that most of the various cad cut films could be overlaid.
I believe I received an email that the web site would be down today for an upgrade but perhaps you can look and call them tomorrow.
Thank You
Ed