Any downsides to tack welding nuts behind the sheet metal for ZG flares instead of using rivnuts?  Car is still in primer.  I was thinking of drilling holes slightly oversized and using flange nuts to give more area to weld to.

Is there room to fish a flange nut between outer and inner sheet metal on the rears after the first cut on the outer skin?

For the fronts I think it's pretty straightforward.

Any comments?

The front fenders would be easy.  But, why not Rivnuts?

I would like the flares to lay directly on the metal without the added gap of the rivnut.

1 hour ago, fusion said:

I would like the flares to lay directly on the metal without the added gap of the rivnut.

I used Rivnuts to attach my flares.  The curvature of the flare brings the top edge of the fire snug with the fender.  There are a couple places where I could insert s sheet of paper snuggly between flare and fender, but I believe that is more due to irregularities in the flare or the fender.

A solution to eliminate even the smallest gap is to run a section of vintage VW Bug fender welting between flare and fender.  I had initially planned to do that, but was pleased with how closely the flare fit to the body without it.  The welting is wide and you would need to cut triangular shaped pieces out of the lower part to facility bending/curving and leaving a gap for the attaching screw that goes into the Rivnut.  Here's a link:

https://www.jbugs.com/product/6730.html?utm_content=shopping&gclid=Cj0KCQjwm6KUBhC3ARIsACIwxBiqriBdDnm73bShSLTwe7wbl9b8efluH6ub93oOYRCG-rVc4Rjo2tAaAmZ9EALw_wcB

Thanks man

23 minutes ago, fusion said:

Thanks man

You're welcome.  Let us know what you end up doing with the flares.