Anybody have any experience with this ? Just dont want standard foam, might be trying to use bus as a source of income, renting it out. Wanted the seats to be a little more than firm. tks PU
Try using "mattress" foam. It is denser than seat cushion foam. You should be able to find it (or order it) from a fabric store or from a upholstery shop.
Contact a foam manufacturer. Use dual density foam, a combination of open cell and closed cell foams, to create a firm yet nice cush when you sit on it. Then cover it with a nice breathable fabric.