Pacer 56......I like it the best as you can remove any excess that squirts out along the edges easily with just water on a paper towel......most of the others I have tried, including E-6000 seem to leave a smear unless you very carefully use dilute isopropyl alchohol. P56 Does take upwards of a week to fully dry, but becomes tack-solid in about 48-72 hrs. I just start my canopy first and let it dry while I do the rest of the build.

I also use a combination of clamps and magnets to hold it in place like Henk Visser demonstrates on his website.