Sealing plexiglass, stop-holes?

[bwilson4web]

Hi,

While removing some caulk, a 3/8" crack formed from the edge. I stop drilled it only to find a smaller, hair line crack formed from the stop-hole. A second stop hole and the part is stable. Fortunately this is just the wing tip cover for the navigation light so I only need a water-tight seal clear enough to pass light.

Is there consensus on how to seal the stop-hole and/or water seal the crack?

I did find an article using Acryfix to repair a canopy. But the article addresses canopy repair by laying up layers of UV cured, clear plastic. For a canopy that makes sense and it would work for the wing-tip cover.

I've also seen references to using "Weld-On #4" and acetone dissolved plexiglass. Mostly looking for recommendations.

I'm planning to use clear, GE silicon to replace the mold-growing, caulk.

Bob Wilson