Not car related. Well, in a way it is. I want to pour a material into the valley where the tires rest on my trailer to fill the gap for extremely low cars. I can block off the sides to create a quasi-mold but what would I pour in there that would dry, be flexible or hard, and withstand the weight of a car? I think flexible would be better so it wouldn’t break but it would have to have a high level of density.
I considered using the gallon can of Flex Seal liquid rubber but not sure how well it’d work. It also says on their website not to use it “underfoot” so I don’t think it would take the weight.