Does anybody know if there is a video that shows the method of overlapping and cutting a wavy line?

you just overlap and cut crooked.....lol and then butt them together.

There is a wonderful new iron on fusible tape to join two battings together. Check at your local quilt shop. A must have for this purpose!

I use this tape, love it!

I've never used the fusible tape, doesn't it flatten the batting when you iron it on?

Here's a blog with pictures
http://www.sewinspiredblog.com/2007/...ith-bonus.html

This person does it the zig zag method, which I have used when making donation quilts that will have alot of machine quilting on them. I still trim away the excess batt from the overlap though.
http://blog.maryquilts.com/2009/12/1...ng-by-machine/

I thought this was an excellent video: http://www.diynetwork.com/videos/sew...ions/3270.html

i just butt them up next to each other so that they are touching but not overlapping and then use big zigzag that catches both sides.

One suggestion would be to use thread that matches the batting....one would think that would be assumed, but I did one with the thread in my machine and in places it showed through if you looked hard enough!

I'll have to look for this tape, sounds like would be very useful.

The advantage of overlapping the batting and cutting through both layers at the same time is that after you remove the small amount of scrap the two remaining large pieces fit together very well. They can then be sewn or fused together without any gap.
This works very well when connecting all the leftovers that have crocked edges.

Can't get the link to play...might just be my computer though (or the operator)