Gluing silicon heater to aluminium I am making a bed for my 3D printer. I have bought a silicon heater (31x31 cm) and I want to glue it to my custom aluminum bed. The tape that it had from factory was bad, so I removed it. I want to glue it to the aluminum and I don't know what type of adhesive to use, I was thinking gasket glue with silicon, but I think that it will have bad thermal conductivity. I found this product, a silicon based,  heat transferring paste, but I think that it will not stick good. What is a good adhesive for this purpose?
I suggest not gluing it. Starting from the top, make a sandwich this way:
Aluminium with holes for bolts - Silicone heater - Thin cork (the one from IKEA, 2 mm thick for office desks is fine) - Thin plywood with holes for bolts (or other stiff material holding at least 60°C)
This way you use the aluminium and the plywood to keep the silicone heater well in contact with the aluminium, and the cork insulates so that less heat is lost on the bottom side.
Also, cork is fire-retardant.
If the heater fails replacing it is simple.
Also, you can and should cut away from the cork some space for a thermal non resettable fuse at 180°C to cut power if the heater overheats.
In my case I should have used one more bolt, as you can see in the photo.