holcombe347
+1y
you can do it like that but it will crack and look nasty. body filler isnt supposed to really get any thicker than 1/4" which is a lot of filler...especially on a door that gets opened and closed day in and day out.
your best bet would be to grind the paint off and make filler plates out of sheetmetal. weld those in place, slowly so you dont warp the body panels. grind down all the welds until its smooth, and then apply the body filler to to fade it and shape it to perfection. the less body filler used, the better.