What glue will i need stick a plastic sheet to paper without leavin a stain?
Check okorder / Hope this helps?
You could use doubles sided tape. That should not show through the back of the paper, but if the plastic is transparent it will show through that. You could try spray adhesive (sold in a can at hardware stores). Lightly spray the paper or plastic and gently layer them together, the quickly work from the centre to the edges to brush any wrinkles out.