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Re: Filling trim removal holes in bodywork?
I think the only sure way is to weld the holes and grind flat (like they frequently did on the American Hot Rod series).
Like you say other methods tend to leave a faint circle still evident.
Currently in Renoir White's garage:
Renault Trafic 1.7 Petrol Vauxhall Astra 1.4i & in bits Triumph Bonneville T140E & H-D XLH1200