Starlite was real there were demonstrations on tv in the 80s the guy was a hairdresser i recall.
the tests took place on the bbcs Tomorrows world. Infact one test the thing reflected heat so well it over heated the lazer that was testing it and the invevtor meltrd a metal slug in his hand whith a bolwtorch.

They did NASA was waaaay intrested but this was during the Cold war and the Falklands. The guy had no intrest in makeing a wepon.
Honestly in no expert but the guys words were "You idiots arnt ready for this stuff yet."

There are a lot if stuff whith him on youtube. 60 minuits did a pice on him NASA tested the stuff so did the Britisn nuclear agency. The stuff is locked up not lost his wife and kids have the formula. I cant link to the vids. Just lookup starlite on youtube.

Honestly its not for me to say eiher way but os dose seme legit enougth fo a lot of companys to want and not debunk despite testing for 20 years.