[SpookyZalost]

So I use a glass heated printing bed and haven't needed any kind of pad, glue, or primer. I have to be careful about my printing settings though because taller objects can sometimes lift off the printing bed.

I do however use hot glue to attach pieces together. As it turns out Hot glue is great for PLA and my hot glue gun gets hot enough I could actually extrude PLA to fuse parts together through it if I wanted to. (360* F)