Lately, I have become a believer in gel CA. I personally use IC-Gel for nearly all my PE. I wear my Optivizer, use needle-nose tweezers to hold the PE, and apply just a dot of CA using a toothpick to the surfaces that need it. The IC-Gel will hold the PE in place in about 10 - 15 seconds, but takes about an hour to really cure. Any little globs that have squeezed out from under the PE are easily scraped away with an x-acto blade once it is either partially or fully cured.
RLF