Print your full coverage design from a sublimation printer
Using heat tape, tape your design in place on the item so the transfer is VERY tight against the product
Then slide your shrink wrap sleeve over the product and artwork that’s taped to the item
Use a heat gun along the item and sleeve and the sleeve will shrink to be tight against your product
Once the sleeve is shrunk all the way, place the item in a convection oven to finish the sublimation process
After it's "cooked" for the recommended time and temperature and cooled off, you'll simply remove the shrink wrap from the item
TIP: For easier removal of the shrink sleeve, dunk the item in a bucket of cool water immediately upon removal from the convection oven. This will help stop the sublimation process and make it easier to remove the sleeve and transfer.