I used the Duplicolor on my '70 and was happy with the result. I used two gallons and went all the way up to the underside of the bed rails. The nice thing about this product is it is very workabe and consistant in texture as well as available in an aerosol rattle can for easy touch up. As with any product, prep is the key. I wire brused and sanded the tub then shot at couple cans of cold galvanize followed by a layer of hammerite then the Duplicolor liner. It did wear through where the heals of my Danner boots always ride, but would have been fine if I would have layed a mat down. I wouldn't use the product on a trail rig where you have a lot of tools and crap on the floor all the time, but is fine for a street driver.