[FAKKY]

Originally Posted by leegreen

Filling that would not be a failure just traditional hot rodding, anyone that disses it has either never built a car with their own hands or is a tool.
Do what you are able but finish your truck and drive it.

What I see here looks pretty good, nice solid weld, clean panel that just needs the last touches.
If you really can't get inside with a dolly, I see two options:
fill it up and fix it better next time.
slit it along the weld with a thin cutting disk until it pops out. Do 3-4 single spot tack welds spaced along the slit and let it cool totally. Grind the spots flat, let it cool, evaluate. add another 3-4 spots and repeat. Keep going until it starts to pull flat. fill what is left. seal from inside.

thx man