What did I buy this week? #7.

I spent all week in Bob's basement using the paints I bought last week to paint Uncle Shlomo's pushcart. This arrived in the mail on Wednesday but I actually bought it a week or two ago: it's a thermal binder, for making paperback books. The instructions inform me I must use their special covers (very expensive) with special (expensive) glue strips, but I saw a video on YouTube and a guy was using regular cardstock and a gluegun. I tried one this way, so far no good. I wonder what's the right glue stick to buy?