After trying all of the aforementioned build interface methods with great frustration, PEI sheet stuck down to the heated aluminum build plate with 3M double stick has worked for me for every material I’ve tried except for TPE (ninja flex).
PETG@95c, ABS@110c, PLA@70c, TPU@room temp all stick really well to PEI.
PEI never has to be replaced. You can scuff it with a skotch bright pad to renew the surface. PEI is available at Amazon for about $20 or so, and some sellers bundle it with the 3m adhesive to hold it down.
