You can see here how i refill empty canw of spray like WD 40 , lubrication sprays and other kind of spray. I used a syringe and compressed air (not propane) with a pressure of 80-90 psi. It' s very easy and not dangerous till this pressure. The prosedure becomes more dangerous if we increase the pressure and use propane as propulsive gas. For a similar mix like wd 40 I have mixed 50 % pure gasoline , 17 % oil sae 15-40 and 33 % white spirit.
You can see how i do this, here in this video.
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