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actiomax said..
My dad reckoned the d in wd40 was for diesel that & upper cylinder oil was his mix but he bought upper cylinder oil by the 44gallon drum & had a diesel bowser. Mix & put in trigger spray gun worked a treat still smelled like diesel but thats a definite improvement on fish oil . I suppose you could use sewing machine oil & diesel or kero to thin for a trigger spray gun .
Be really careful of anything flammable which you put in a spray gun and vaporise out into the air.
It's highly explosive, even though the unvaporised stuff isn't.
You can end up with a big fireball blowing up in your face and it can result in serious burns.
Make sure there is no ignition source anywhere near the operation.
No cigarettes, no friends or rellies walking up with lit cigs,

no electrical switches, no engine exhausts, no arc welding, no oxy welding, no static spark sources, no nothing.