Undercoating
IF THE IMAGE IS TOO SMALL, click it.
Since paint dries too hard & brittle for the undercarriage (it chips, flakes, & causes rust; even when applied to NEW steel at the factory), the best coating for it is undercoating (naturally). It's cheaper, quicker, easier to touch-up, and doesn't flake off like paint, collecting water, sand, & salt. The only prep necessary is a few cycles of pressure-washing & drying.
Rustoleum SiteCan Label 
![undercoating95b.jpg Undercoating
IF THE IMAGE IS TOO SMALL, click it.
Since paint dries too hard & brittle for the undercarriage (it chips, flakes, & causes rust; even when applied to NEW steel at the factory), the best coating for it is undercoating (naturally). It's cheaper, quicker, easier to touch-up, and doesn't flake off like paint, collecting water, sand, & salt. The only prep necessary is a few cycles of pressure-washing & drying.
[url=https://www.rustoleum.com/product-catalog/consumer-brands/auto/truck-bed-and-undercoating/rubberized-undercoating]Rustoleum Site[/url]
[url=https://www.rustoleum.com/-/media/F688E8C6023342EB9BB37B5E564CB119.ashx]Can Label[/url]](https://www.supermotors.net/getfile/1170434/fullsize/undercoating95b.jpg)