I went to the local hardware store and asked for Isopropyl Alcohol, and they looked at me as if I dragged a unicorn out of my nose. They suggested I try something that's called "red spirits" here i Norway, which I think is ethanol.
Another store had Isopropanol on their shelf, which kind of sounds like Isopropyl and Alcohol together. Could that be the thing? It was blue in colour. On the contents it just said 100% isopropanol...
I checked out the ESB research images on The Prop Den (great site for Vader stuff!), and compared the original neck flare to mine. My neck is a lot wider than Vader should be. If I bend it using heat, is there a chance it will unbend itself in time? Should I look for a permanent solution to hold it in place (metal hooks connected with a band of sorts was my thought).
One crazy idea I had was to
not polish the parts that are supposed to be painted gunmetal, perhaps that will result in an interesting look
PHArchivist: No way I am making an exploded version! Unless I have a horrible melting accident while bending the vinyl, this thing is a museum piece to me.
NoHumorMan: Thanks for telling me about the Rubies helmet, that was new to me. I see several on eBay for just 50 bucks, it looks like quite a bargain! Could I use it as a guide for the neck flare, perhaps?