- Step 1: Loot the empty vial from Professor Slate
- Step 2: Click on the potion on the table he spawns next to
- Step 3: Use the empty vial in your inventory
- Step 4: Click the potion again
- Step 5: Use your nearly full vial - You should now have 2 instances of the Polyformic Acid Potion buff
- Step 6: Use the empty vial again - You should now have a nearly full vial and a half full vial
- Step 7: Use the half empty vial, then use the empty vial - You should have 1 nearly full and 1 nearly empty
- Step 8: Repeat 3-6
As I said, minor, but if you like the model this will leave you with 6 hours of the transformation stored up, and 1 full hour on the buff, leaving you running to Scholo about half as often.
It's not a true dupe, since it still leaves you with 1 of each instead of a potentially infinite amount of nearly full ones.