If your stripping the marker down the o-rings need to be greased, with a silicone based, light grease. But be carefull removing and inserting parts that have o-rings, because they will pass air holes as you refit them, and may chop.
The best way to keep your marker lubed, is to put a couple of drops of love juice in the airline under the minireg, and dry fire about twenty times.
I have both love juice oil and grease for sale.