Interesting Topic indeed!
I hope that the again a mod or patch will at least make it more than just eye candy.
Back to facts:
The Alberich synthetic rubber systems main vice was the adhesive used which was unreliable at best. As mentioned here before, the sheets tended to get loose and flap around creating more noise and resistance.
The adhesive was improved, but again the war came to an end before any futher breakthroughs could be made in this area, and even the British apparently after the war gave up when looking at German examples as the adhesive was still an issue afterwards for a while anyway.
Tarnmatte was the radar absorbant material use to cover protruding parts of the U-boat such as the Schnorkel cover heads, not sure about Periscopes but claimed to be 90% effective to reduce the radar signature.
Of course something seldom mentioned about Alberich, as it covered large areas of the boat was the added weight that it introduced.
Still very interesting and amazing technology for the time.
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