Nik22

I’m restoring a 1960’s Corgi Batmobile and I’ve hit a snag, one of the rear fins on the car is badly worn so I want to restore it to match the other side. I’ve never done anything like so I had a google and started using Milliput which worked great initially... except it didn’t set (I used a 1:1 ratio). Do you guys have any ideas or advice for how I could approach this? Thanks I’m advance!