Perler Snappix Bead Canvas Sets

Get creative and make your own mosaic-style bead designs with these sheets of mesh canvas available in black and frosted from Perler Snappix. Each package includes two 12" x 12" sheets plus instructions. The versatile canvas can be cut into smaller shapes and sizes, or two pieces can be joined together for making larger designs. Because of its flexibility, the canvas can also be rolled into a cylindrical shape to create home décor items, such as a lampshade cover, planter cover, or pencil cup cover. The possibilities are limitless!

Perler Beads sold separately -- fits Standard Perler Beads

[Allan-umkk]

These are great until you want to connect them together, every time I try the beads just don't want to stay in my canvases, they always want to pop out, am I doing something wrong or something because the instructions seem unclear.
If what I'm trying to do is the wrong way they the product is just faulty and they can't be mounted together the way the instructions say.