I would like to say first I've never actually tried this and not sure how it would work. For stubborn engines, you could use ether. I use this stuff called Quick Start. Now, I've only ever used this on my old 67 mustang and a lawn mower. It works awesome though. Two problems I for see. One it only takes a small amount sprayed into the carburetor of a full size car. you'd have to get a small small amount in the planes carb. Second, not sure how the glow plug will react to it. It may burn the ether off before you can flip the prop. I don't have any stubborn engine right now, but I'll let you know if I ever try it.