[USER=8104]Russivo[/USER] I'm no pro (yet), but I'm pretty sure it depends on what method you use to scratch build. For my lid it was not very bondo intensive, and I didn't use any resin. But since I pep helmets every once in awhile I know what one will need. There are only the two things you need. Bondo and fiberglass. I just use the regular bondo, nothing fancy. Some people swear by using the bondo glass, but I guess its all based on personal preference. For my fiberglass, I use Bondo brand fiberglass, with bondo brand fiberglass cloth. Branding probably won't change much of anything, just depends on what the places carry. I got all of that at my local Lowes for a total of about $40, which is pretty cheap even for a unemployed 16 year old (AKA me). I bought the fiberglass I year or two ago and I just barely ran out Wednesday. Hope this clears things up 