So i have a 97 k2500 extended cab. Super clean and I wanna keep her that way so im wondering about doing bed liner along the rockers just under the trim line. What im wondering is how much line will i need/what brand is recommended. Id like to use aerosol but i do have a paint gun if i need it. I live in Michigan some spots have started surface rust but im gonna fix that before the bed liner. Just dont want the salt to kill my truck i also wanna under coat.