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I can see clearly now
The old Perspex windows were tinted, cracked, scratched and fractured. The tint meant that it was quite dark and gloomy in the cabin and unnecessary use of the cabin lights, which obviously impacted on the batteries. I chose Polycarbonate to replace the windows, mainly because of its strength and longevity which also meant that I wasn't able to get tinted. The downside of clear windows, you can see all of the sealant. An unavoidable side effect which I am looking you rectify, possibly with stainless steel surrounds, but we will have to wait and see!!
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Lichen and scratched
Even after a good scrub, the perspex was still hiding remnants of Lichen around the edges of the windows, the scratches showing how "passed it" the windows were
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Cracking
The perspex has started to develop cracks where it had been secured to the surrounds, some of these cracks had opened up enough to start letting drips of water in
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The original sealant
The original sealant had completely dried up. The contact between the perspex and the sealant was merely because the two were next to each other, it was quite easy to slide a piece of paper in between. The new windows were sealed using Butyl rubber tape, this I am sure will give years of good performance.