| A month and a half is a very short life for even a cheap blade, unless you're really abusing it. But considering where you live, Seraph, you probably do need to protect your blades from moisture and humidity a little better.
I'd avoid oil; it's hard to remove so completely before use that you don't risk getting residue on your opponent's jacket or lamé. It also doesn't protect fully unless reapplied quite often.I'd avoid WD-40 as well, for the same reason and also because it contains solvents which might not be good for blade wires and glues and might gum up tip parts when you get an electric blade. There is also some speculation that the solvents cause the oils to evaporate off faster, vitiating the protective effects. After all, WD-40 was created to loosen up frozen metal components, like rusted bolts and nuts, rather than as a surface protectant.
You might try a paste wax, like Johnson's or clear (neutral ) shoe polish. This is what many museums and private collectors use for armour and weaponry. It can be wiped off more readily and doesn't stain as permanently as oil.
As others have noted, keeping the blade in a PVC "scabbard", especially with one of those silicone gel dessicants in it, can help a lot as well.
And give the blade a rub with a Scotch pad or steel wool every once in a while, before putting the coat of wax on.
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