I won't go into all the details of how this tragic event occurred but during the final buffing of some Fiesta Red nitro lacquer I burned right through to the wood on the inside edge of the lower cutaway. I think I can repair it so it's invisible. My question is this, even though Fiesta Red is an opaque finish will I need to re-spray the white undercoat that I sprayed on the guitar to begin with? If I don't put a coat of the undercoat down will it change the colour of the FR? As I've softened the edge of my burn through it has exposed a band of the white undercoat so the 'wound' now has a thin white perimeter around bare wood. What's the consensus here concerning the need for the undercoat?