I recently repaired two LARGE gouges in a '71 endura bumper. Both "chunks" were still attached, but barely.
I used 3M stuctural adhesive to reattach the chunks (let them set up over night under compression using C-clamps with flat wood pieces), finished them using 3M 2-part flexible body filler. Am VERY pleased with the results, the end result cannot be determined with primer applied.
Do the search on this forum, I got advice on these specific products from someone here.
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