I vote "NO" your DH should not continue. It will melt!!!
I have a question about thread. A friend of mine gave me 6 spools of Sulky embroidery thread. I used it to quilt a table runner and it worked fine. Started a second table runner and half way through the thread started shredding. I changed my needle, did fine for awhile then again started shredding. Maybe shredding is the wrong term; it looks like it's unwinding into 2 ply thin threads. What do you think is the problem? Can I use embroidery thread to quilt? I don't understand why half the spool worked then the other half isn't. Help me out please!