I have a 09 Phoenix 721 with a painted trailer. The boat originally came from Ohio so the salt I’m assuming got to the trailer over time. It doesn’t have any spots that are rusted threw that I can see. I want to have it sprayed with some type of bed liner like linex or rhino liner. I have a friend that can bead blast it down to bare metal. Would you guys recommend this or just let the guys spraying it do there own prep work?