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I am a clear bra installer but I have some vinyl experience.
I have done my roof two different times with 3M 1080 satin black.
Both times I pre-stretched the whole piece dry.
The first time, I started in the center like you said but got some stretch marks at the valleys.
The second time, I did the two outside pieces first. This creates a bridge across the whole center. Then I swipe each valley across using my hand in a micro fiber. Then I finished up the center.
Trimmed and wrapped all edges. Credit cards work great for getting underneath the seals.
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