Hope this finds everyone well. I’ve been an internet lurker for some time and just joined the community this week, thanks for reading my first post. I came across a video on this subject and I’d like to share it as it might prove incredibly useful at the bench and I’m curious to see what conversation this might spark regards to its usefulness for protecting elements of a piece you don’t want overheated. I’ve only just discovered it and haven’t had an opportunity to try it myself.
Starlight is a puddy that is capable of resisting incredibly high temperatures while shielding anything behind it from the heat as well. In the video I’ll link to this fellow applies a torch to his hand, among other things, at length with nothing more than what looks like a bit of tortilla.
Starlight is the name given to the material by its inventor, there’s an odd story behind it and, secrecy behind it’s composition and it’s reasons for never becoming commercially viable but it’s become a bit of an internet phenomenon in the last few weeks after some one managed to create a facsimile and it’s spurred a lot of people to explore it further.
The first version shown in the clip below from Night Hawk Projects can be made at home using a bit of baking soda, cornstarch or flour and PVA glue as a binder. As a flame is put to the starch/flour creates a layer of carbon that deflects the heat while the baking soda produces CO2. He provides some explanation of the chemical mechanisms at work as he understands it.