Thanks for sharing your method.
That's what I tried after the filler/glaze which did leave a too-sharp edge. The underside of my bumper cutout fold is not flat, which added difficulty.
I just don't have the touch to make it uniform.
No biggy for now. If I get it painted a pro will have to prime and sand it again.
But I am entertaining making a tool just for fun. 3M and others sell abrasives on film substrates that will bend sharper than paper so just need small diameter concave mandrels.
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