sounds like he does not have the experiance and has underquoted a bit. let this be a lesson to all ,sometimes the cheapest has a reason for being cheap. i normally use 1.6 sheet to fill the hole welded slowly then lightly tapped up, you can just about file finish it from there.i have used this method dozens of times and it works a treat on infilling big panels.should have some pics in the puta somewhere, ill post some when i find them