Hey Andy G, I had my sunroof re-tinted with dark 99% UV tint. Massive difference to comfort inside. No problems so far, not sure how glass could crack? Mine came with sunroof. I wouldn't have ordered it. Defeats the purpose of all vertical glass to some extent, which is one of Defenders leading design characteristics in a hot climate. But the heavy tint works well and it's nice to have the light and breeze from above while slowly roving through the bush or on the coast (too noisy at highway speeds). Enjoy!


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