lladouceurfelio - In my case, the bubbling on the front skin was caused by insufficient adhesive & 11 years of facing directly toward the sun. The bubbles on the passenger side were caused by water intrusion through the front exterior speaker. I had all the wet wood removed and replaced, then re-adhered the skin. There were still some small bubbles that did not flatten out due to the "memory" of the skin. I drilled through the skin and injected contact cement,,let it dry overnight, then rolled it flat. The side looks much better now. I filled the holes with Bondo. For the front, we covered the frame with 1/4" luan, then adhered new skin over the luan. The frame is 2 x 2 sticks. By adding the luan, we gained a much larger and effective surface for the adhesive.
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