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In order to avoid the foam to be crushed while sanding, I kept it on the upper grille for support (which is removable on my car), especially when I applied the epoxy resin coatings. That way, the foam maintains its shape and it is not damaged in any way. I did not use fibreglass though. Seems to be quite solid without it, even after a few months of usage. We will see how it handles the winter.
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