Ender bed layer adhesion.

Hi,

New to the forum and I am enquiring for our DT department here at rhe
college I work at.

We have two XYZ filament printers and we have constant issues with the Ender
self adhesive bed layer coming adrift, peeling and curling and generally just
not wanting to stay adhered to the aluminium base of the platform.

We clean the aluminium thoroughly, have tried sticking them down whilst
both hot AND cold.  Sometimes they stay put and we get a few successfull
print jobs. In fact every job is successful with a good stuck down bed.

I guess bulldog clips or some kind of plastic U section but I would see these as a
sketchy work around...

We would appreciate any thoughts or input?!

Thanks....    Trev