Yeah, I'm not exactly sure how PAM works either (live animals vs. eggs), but I can tell you that during the QT period when we got our boa, we found she had mites.

Followed the directions on the can and it got'em all.

I know that many people here will even preventively use PAM on new snakes to their collection, PAMing the paper substrate that goes into the tub kind of thing.

It's expensive, the can does not have pretty graphics, but the stuff just works. =)