The ply has some old fibreglass insulation behind it! To remove this safely, it is best to have some gloves and a good mask so you don't inhale any of the fibres, as the only thing worse than itching skin, is itching lungs!
This was the kind of filthy mess that was on the panels from years of being a work van
This is what the panels should all look like once you have given them a thorough degreasing, nice and clean
Next, put the flashband on the panels in strips. Remember to do the wheelarches, as this is where a lot of the road noise will come from. Ideally heat the flashband a little before applying, so that it becomes a lot more flexible and is easier to apply
Once deadened, you can get the first layer of bubble wrap insulation on. Spray the panel with the glue, and also a bit on the insulation, let it go tacky, then apply. Smooth out and around all the edges, then seal all the edges with your aluminium tape
Then, fill the cavities/panels with the plastic bottle insulation. Shove it in all available holes (ahem) to help with keeping things warm. As long as it isn't too close to any electrics/wiring, get it filled if you can. I admit, I used some more spray glue just to hold the insulation on the panels. This may become a problem if for some reason I ever have to remove it all, but, I don't plan on that happening, so, I glued away
Once that is done, I put another layer of bubble foil insulation over the top of it all. This time also covering the wheelarch. This top layer seals the insulation in, and will hopefully all result in it staying cooler in summer, and warmer in winter. Once again, this layer is sealed with foil tape also.
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