Ok, I'm going to chime in. I've been using Dichro for over 20 years. CBS is the only coater I use. Standard thickness is easier to work with. I also pre-fire my 104 COE (not 90-I'll explain later) I attach the dichroic coating side down only about 1/2 way around the bead, leaving the remainder hanging off. Work on the first half pressing the middle of the clear glass (the glass the dichroic is coated onto) down, then stretching the clear over the edges and pressing down. Glass wants to be 6mm, right? So it wants to ball up on top of the dichroic coating to be 6mm. It pulls the metal around with it and that's what scums so anchoring it down as quickly as possible is important. After you've done the first half, continue to melt the remaining strip down onto the bead the same way.
The reason I don't pre-fire 90COE is two fold; first 90 is stiffer so it doesn't roll as easily and for my it keeps me from mixing up my 90 and 104 strips.
Hope this was helpful.
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