Hello David,
The resin used is Encore 30 which is a Polystyrene based resin rather than Epoxy. The data sheets for the product talk about the material in its pre-cured state and say that the auto - ignition point is 490deg. However the resin is a lot more stable once cured, especially since the actual glass is non-combustible.
As you say the exhaust on my orange car is very close to the side panel, 5mm, and has caused negligible damage. The side repeater has suffered a lot more. A comfortable clearance i say would be 20mm, in my experience.
Hope that helps....AndyH
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