Just a quick update, filled in all the cracks and the big hole and I’ve left it for 2 days before sanding with 100 then 600 wet and dry. Looking really good and it passed the finger test. Bought some Hycote primer and the Fiat 249. The primer’s gone on today, with probably 5 coats. I’ll let it harden for 24 hours before sanding if tomorrow. Quite happy with the progress so far.