Glow fuel (nitro) is methanol based and can be purchased with various nitro content, 10%, 15% or 25% being the most commonly used fuels.
It should always be kept in its proper container with the lid tightly sealed. This is because methanol can absorb water very quickly, including water molecules that are carried around in the air as moisture. Once moisture has got into the fuel, it's pretty much wrecked.
If kept properly though, glow fuel will last forever; you'll use it all up way before it starts to deteriorate.
When it burns in a model airplane engine it can leave a nasty oil slick over anything that the exhaust gases come into contact with. The amount of oil varies depending on fuel quality and manufacturer.
For this reason, it's a very good idea to always carry a can of fuel cleaner with you and plenty of old rags. A good cleaner will cut right through the oil and remove it completely, whereas just wiping it off with a dry rag will never remove it completely.
Always spend just a few minutes cleaning your model after every flying session - it's worth the effort!
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