Undercoat vs Spray tar, or a combo

[wankler]

I have been doing both to my 93' every year, it gets cold, wet and they put salt on the roads where I live.
Kinda curious what everyone else is doing to keep er' solid.
Cheers!

[azgtx]

Living in the desert works for me.

[progt91]

Known rust proof by far is the best to use. Gets in to the welds. Undercoat doesn't get in to the small crevices

[whistler]

progt91, do you mean Krown rust control?

[progt91]

Yes. That's the best stuff. Thin enough to get in all the pinch welds in the door, rocker panels, and quarter panels. I had a body shop and we found that the best product to use to prevent rust from forming. It's best to get it sprayed once a year