I have use the tape, don't have the iron to hot, just medium. it is very nice but a little priecy.

I don't bother sewing the batting together. I just butt them together on my longarm and quilt away. A friend who longarms 30 quilts a month for charity taught me this. Never had a problem with any of the quilts and you can't tell once they're done.

I find when I have zig zagged it is far too tight. I prefer to just whip stitch.

If I am spray glueing never join them but put fabric strip on.

I, too, am a W&N user so can't speak for any other kinds of batting. But, I've joined pieces using the zigzag on the machine with no issues with the feed dogs. Have also whipstitched by hand. My only recommendation when doing it by machine, with W&N in particular, is to watch which way you lay the pieces together. Otherwise you do get stretching as Julybaby8 mentions. And if you're planning to hand quilt, I don't know how advisable the heat tape would be for that purpose.

I overlay the two pieces of batting to be joined and make a straight cut so they will butt nicely together. Then I line them up on the iron board and use 1.5" strips of lightweight fusible interfacing. I do both sides. You can NOT feel any stitching and it will stay in place while you do the quilting.

I just did it for the first time, just butt up the ends and zig zagged them together. Worked like a charm, no problems. Good luck!

I've done two quilt as you go quilts and used this product to join the batting together. After many washes, the batting is still together and holding up well. Just a word of caution though - make sure your iron isn't too hot when you press it. I learned from experience!

I've done it with a wide zig zag stitch.. Happy quilting!

Same here. I just did it yesterday for a small wall hanging I was making. No problems getting stuck but it was cotton batting.

I hand sew it usually but have tried the iron on tape on cotton batting. Worked like a charm but I don't think I'd try it on poly.