I've never welded thin metal before and am wondering the best way to approach this. I have an old car that I'm going to weld some replacement panels on and dont really know what I'm doing when it comes to thin stuff. I was told to just drill some holes along the edge of the new panel put them in place and tack them in there then fill the visable edge with puddy and you will never know. Is this the way I should do it or is there another and better way to go about this? any information will be greatly appriciated.