THIS IS A LITTLE PIECE I WELDED UP TO SHOW YOU HOW THE WELDING AND DRESSING IN THE WELDS EFFECTS TO WELD PRIMER ,
when i do my welds i do one spot weld at a time let it cool down to the temp of the metal before i did my weld . i place the welding wire just on the edge of the last spot weld and and do the next spot weld .
by starting your weld part way on your last weld you run less of a chance to blow a hole thru the thing .
when it comes to your weld primer you do not need allot of it just a light covering is all you need a little zinc goes a long way to protect metal from rusting .
as you can see on the back side the weld primer doesn't burn like many may think . after all zinc is a metal . in most cases the little bit of bare from the welding will take so long to start to rust you and or the car would be dead and gone before it is a problem .
i used .035 wire this is not the proper wire to weld sheet metal . so the welds are twice the size as they should be .
you should be using .023 or .025 wire for your sheet metal work .
when you grind/dress in the welds just like when your welding heat is evil so do not over heat it when your dressing the welds in . you shouldn't have any lumps and bumps left after your finished grinding should look like all one solid piece of metal .
this way your not having to use lots of filler to get the patch to blend into the rest of the panel .