No, you can not use T86 to export out of an FTZ
Merchandise shipped to the US is deemed to have been imported into the country before being admitted into de FTZ.
Since the goods have already been imported into the US before they are taken to the FTZ, the CBP analyzes the importation at such a point rather than when it is dispatched from the FTZ.
If bulk shipments are sent from merchants in the exporting country and dispatched to the US before gaining admission into the FTZ, they would not leave the FTZ duty-free as they would have already been imported.
Since most merchandise is received in consolidated bulk shipments when imported and then stored in the FTZ, they would not leave the FTZ duty-free they would have already been imported.
The reasoning for this is that the total value of the shipment received at the FTZ which doubles up as a distribution center is usually greater in aggregate than $800 which means the duty-free exception is not applicable