I use a weld through spray made of zink as protective layer before I weld the double layer metal together. I dont know how effective this is, but I intend to use some sort of undercarriage spray to penetrate between the metal sheets after painting the car. But I cant understand anything else that this is a rust trap how you do it, if it's supposed to look factory stock. Next time I will weld the NOS support metal for the rear bodymount.
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