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People printing Taulman 618- what are you using for a build plate?

Using Blue painters tape I am getting warpage/separation. I'm going to try Elmer's glue stick on Blue tape- maybe this will be better??

The Taulman site suggested garolite, but the garolite I bought from McMaster Carr is so badly warped that its unusable. I've since read online that this is a commopjn problem. Mcmaster says their sheets are not flat.

Any advice?

The only surfaces I had luck with were Garolite and poplar board.
I had some luck with UHU glue stick on glass but the parts tended to warp once they were released from the build plate I keep meaning to try letting the part cool then reheating it to try and release the stress in the model.
Frankly I had pretty much given up on Nylon until I tried bridge, it's much better behaved than the other 2 taulman Nylons

The corners have stayed down for me with blue UHU glue stick on glass as long as I added mouse ears.

I've used 618 and 645 - I want to try the bridge next, but I don't have any yet. With t-glase, I've had the best luck on plain clean glass.