Your source (particleweave), used 225 Fahrenheit, not Celsius in this video?
http://986forum.com/forums/diy-project-guides/51565-how-open-sealed-headlight.html
His 'old' video lists it as 225F which makes sense seeing as he's in the US.
So maybe double check with him? I can't claim to have done it myself and they certainly aren't sealed with Butyl rubber which is all I've worked with to date, so don't take my word for it
