I heartily agree with Mirax H. I've sewn sticky backed velcro to fabric, and the machine doesn't like it at all! The adhesive grabs at the needle and makes it like you're sewing really stiff/thick fabric. At best, you end up with residue on your needle which can ruin whatever you sew next, and at worst, it can wreck the machine's cogs and gears (trust me, I know from experience!)
Si