Father and son restoration 1st car

Excellent post and great relationship building process. Would like to ask a question about the material used to smooth out the seam between the scoop and the hood. The reason I am asking is that my bodyshop sadly says that they do not know what to use to ensure that there is no future cracking. Appreciate the time and effort in answering this. Thank you

We used 3m panel bond. It can be spread then icing body filler. We open and shut the hood a hundred times adjusting the hood and finishing the car and its still good. Time will tell though.