Since DavidF wanted to see it, here's the sprayer I mentioned on my other thread. When I bought it, I believe it was advertised as a "mouth" blower. Umm, no. No. I ain't putting my lips anywhere near that. God knows what you'd catch. You also need lungs of leather. It is brass, I promise, just needs a little polish. Basically, you pour a mix of graphite and either acetone or denatured alcohol into the main body, and use a blowgun on the trumpet looking bit. It actually has a decent spray pattern. I think a crafty person ( such as members of this board) could make something like this fairly easy. It's basically just a siphon gun.
https://www.freemansupply.com/produ...plies/foundry-specialty-tools/mouth-spray-can If you need one V/r HT1