I love W&N when glue basting. I have also used poly batting successfully. I run an even stream of glue every 4" or so. Often it will separate into small beads but that seems to be ok. I don't go backwards. I just keep going nice and even. Then press that side and flip to the front. I don't seem to have any issues and get a good hold if it is pressed nice and dry. More can be added to the edges if necessary. I space it as if I were quilting 4" apart. Staying nice and steady is most important to me.