Yes, solid core wire is what i'm actually using, i find that with thin stuff and a tight fit, only minimal filler is required.
Today i'm going to try directing my heat not directly to my seam like sixguns mentioned. I am curious though, what kind of fender is that? And also if you dont mind me asking, how many hours would it take you to install 5 patches on there? Seems to me like a lot of work. I am just curious because i am new at TIG welding sheet metal and i know it would take me a lot of time to do so.
Thank you all, and if anyone else has anything to add up, feel free to do so!