I am using fridge pump with great resaults and have build many boards with the same pump. Sometimes when it is a bit cold the pump was on for more than 24 hours without any problem. It produces mor than 0,8 negative pressure. Until now it has not let my down.
My fridge compressor has 4 tubes. Two are sucking the air in and two are blowing the air out. You must use both "intake" tubes.
The oil from the compressor is not the problem, since if a drop comes out, it comes out trough "blowing" hole and newer from the "intake" hole.
The vapor is also not a problem. When working with epoxy anyway it is best to work outside or in a good ventilated room and allways use the mask with fiters for organic matter.
I am sure a 5000$ pump works better, though....