I’ve had to section in a piece of the floor on my f-150 crew cab and have been grinding down the weld line on the underside of the crew cab. Here is a picture of the underside weld line: . Once I got the weld line ground down, would you just hit it with some matching colored por-15 and leave it alone. Or what is the correct way to cover up the weld line so its invisable? I could use some advice.