Cold + Colder Weather and Rimless Drill Mounts with Polycarbonate lenses can show star like cracking from their holes.
In Freezing temperatures it can happen as well as when the drill holes have been drilled with a dull drill or too fast with a new one, that heated up and microscopically damaged the drilled hole.
Doing some research into this problem we came up with a solution to cure to this problem. We found a chemical solution that can be applied in less than a minute right before assembling the glasses. It is a highly volatile solvent mix that just about dries instantly after having fused any microscopic rips in the drill holes, that will no more be prone to cracking.
One drop per hole will cure all future problems of cracking holes.
Vision Ease is recommending the use of "Drillseal" in the use of Polycarbonate lenses in drill mount frames, as a big benefit.
See their Technical Tip in: " Polycarbonate Lens Drilling For Rimless Mounts " at:
https://www.visionease.com/wp-conten...echTips916.pdf
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