Interesting! I was just reading about aircraft dope (https://en.wikipedia.org/wiki/Aircraft_dope https://en.wikipedia.org/wiki/Aircraft_dope) which had a simila

Interesting! I was just reading about aircraft dope (https://en.wikipedia.org/wiki/Aircraft_dope https://en.wikipedia.org/wiki/Aircraft_dope) which had a similar purpose. Unfortunately, the material of the day was nitricellulose, aka gun cotton, so had a habit of catching fire.