You will need the metal seam roller to give your glued seams a strong connection and as well to get airbubbles out of the seam, which might occure from time to time. After you glued your seams and pressed them slightly with your finger together, you will take the seam roller and roll it with light pressure over the seam. Done!

I prefer the metal seam rollers, because they are heavier and more stabile than the plastic once. I bought mine in a leather crafting shop, but you can as well easily order them online. Plastic rollers are available in almost any home improvement store.

It is more handy to have a “smaller” roller if it comes to the seams, especially the curved seams. My current one which you can see on the image is a little to wide if you ask me, but great if you want to double glue some bigger pieces.