Check the size of your needle, check the thread. The wonder under does not like too small of a needle, or a cheap thread. Make sure you have none sticking out where you are sewing the applique on.
Seal it good, and make sure it sticks. I prefer steam a seam also, after trying other products. But, whatever your machine likes, is what you have to go with. Good luck.
10/11/2009 6:01:26 PM