Skim bedding, in my professional opinion, is a waste of time.
IF a rifle is going to be bedded, it should be done with a volume of material (in most cases epoxy) that's of sufficient thickness to deliver a clean presentation in addition to increasing the surface area contact with the action.
Essentially you lather up your receiver in a coat of wax to prevent the resin from sticking to it. Then you apply a layer of epoxy (everyone has a pet favorite) to the stock and squish the two together. Once the resin cures you pop out the receiver (hopefully) and clean everything up.
The idea is to provide a tension free nest for the action to sit in. The resin should seal off the underlayment and make the stock more resistant to changes in weather.
There's varying degrees of success with this. I'm fortunate to have a lot of experience with stocking guns and I have unique tools at my shop. Here's one of mine:
This unfortunately is often a typical example of others who attempt to do it. Decide for yourself what you'd rather have.
Hope this helped.
C
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