DG-1 heater has arrived. That looks so small for such a big mirror
OK, I'll give it a go. I think I'll connect it to the mirror, let it cure, then sit the mirror out facing the sky on a dewy night and give it a blast and see what happens - worst case testing.
Wish I could have fitted the DG-2. I'd suggest anyone following this path look for a way to make a new secondary holder into which the DG-2 will fit.