I'm making a tshirt quilt for my son and had been doing fine with the lighter weight product. Saw the heavier weight was less expensive per yard so got that - now I have no idea how to remove it from the back of the shirts I used it on. Only later - too late - did I read don't sew by machine. Have been trying to hand sew it but am about to give up and start all over. Any ideas?

Yes, give up and start over.
:-) Just teasing you. :-)
I don't have a clue. I have and probably never will do a t-shirt anything. I am really sorry this has happened. Hope you get some tips and tricks.

I don't know if you can. Maybe someone will have an idea of what to do.

I don't think you can remove it. Maybe take some fabric paint and run a bead along the edges and decorate some how?

Have you tried to reheat it and try peeling it off ?

Well... the good news is once you iron it down? It should remain glued down forever. Sewing it won't be necessary.

The bad news is, if you try and hand or machine sew through it to quilt, it will probably gunk up your needle. :(

I did this on my T shirt quilt I made for DD. I did finally get it quilted but my name for it is the Quilt from H***

I will tell you after I ALSO made this mistake using this product.... it does... after 3 years of sitting and being called UGLY names... get easier to sew through....

Thanks to everyone for your tips and info - really appreciate it - think I'll use a double leather thimble and a plastic canvas needle, it won't be pretty but it will be done!!! Thankfully it's only on a few of the shirts so the majority of it will be ok....hopefully!

I've used the non-sewable Heat and Bond and then tried to stitch it with my machine. It really gunks up the needle so the only thing you can do is deal with it and keep cleaning your needle every so often (very often). I haven't tried any other way to deal with trying to remove it once you have already bonded it on. I used a zigzag stitch on my banner using it and it seemed like every foot or so, I had to stop and clean the needle. I found that I didn't need to remove the needle on the machine but just take out the the thread and then with another needle, poke the hole of the sewing needle to clear away the gunk. But it was a real pain to do this throughout the whole banner. Now I know better to buy "light" sewable Heat and Bond. Lesson learned.