The pump is made to pull what I, in my layman's understanding, call medium to high vacuum.
For bagging kiteboards (especially onto light eps foam) we only want low vacuum.
So, the pump wants to pull against 27"+ vacuum.
We only need 10-20" to laminate without crushing foam.
To keep us and the pump happy, put a reservoir between the pump and the bag, and a regulator between the reservoir and the bag.
Also, a pressure switch between the pump and the reservoir.
The pump will make vacuum in the reservoir and cut off, saving itself from wearing out. As vacuum drops, it will kick back on.The regulator will keep an even pressure in the bag.
It's normal for the pumps to lose oil (should be as vapor, not smokke though!)
You can put a filter/condenser thing on the exhaust to recapture it, or just make sure you use it outdoors and replenish with vacuum oil from an appliance parts/hvac supply store.
But the pump should last a while even if you abuse it, in case you don't want to buy and hookup all those extra components.