paint floor before lining?

[runamok151]

so i've finally got around to working on replacing the floor pan in my blazer. when i'm done, it's getting a thick coat of either durabak or linex. i got the passenger side done about 2 weeks ago. i was looking at it today and making plans for working on the drivers side tomorrow. i noticed that there is some light rust starting on a lot of the areas where i welded and ground 2 weeks ago. my question is, should i sand off the rust and primer this bare metal or leave it and just give it a light sanding before it's lined?

 

[cdoggwsu]

I'm contemplating the same thing. I was considering putting a coat of POR-15 or Chassis Saver...a little tougher than primer for some extra protection, but I don't know how well it would etch for bedliner. I'd be inclined to think that any sort of primer or sealant would ultimately make little if any difference as long as the metal was prepped properly.

 

[AJMBLAZER]

Most GOOD (IE the places you want to use) bedliner appliers will sand and clean up the area they are spraying before they do the job. Unless you have holes or rust coming up from the bottom I wouldn't worry about it that much.


I have put POR15 on spots and had it Rhino Lined over without any issues but none were bigger than a square foot at most, not an entire bed or tub.

 

[runamok151]

cool thanks.

 

[slyguy_22]

Most places when they spray new beds and such (ie these areas are already paint with basecoat clearcoat) they take 3m scotch brite pads and lightly scuff the paint before applying the liner. I would say lightly sand the rusty areas and then spray a couple nice coats of primer. the liner will still bond to it just as well, plus you will have an extra layer of protection.

 

[uao85]

If it is rusting, I would grind out all of the rust, spray down some self etching primer for a few light coats, lightly scuff it up with 400 grit sand paper, and then spray down the coating, or if you want to use por15, put that down after the etching primer, scuff it up and then coat it with liner.

Remington

 

[runamok151]

it doesn't need to be ground out. its just a little rust forming on the bare metal left from where i welded in new floor pans and ground the welds smooth. i was thinking i'd put a little primer on it so i wouldn't have any rust starting between the new sheet metal and the liner.

 

[uao85]

it doesn't need to be ground out. its just a little rust forming on the bare metal left from where i welded in new floor pans and ground the welds smooth. i was thinking i'd put a little primer on it so i wouldn't have any rust starting between the new sheet metal and the liner.

well by ground out I mean all the rust removed completely no matter what the method, grinding, flapper disc on a drill, whatever. Primer wont seal or stop rust, its just meant to help level out a surface when doing body work. A self etching primer will bond to and seal the metal surface, as long as there is no rust. If you do it right the first time, you wont have to go back and do it again FWIW.

EDIT: you can also get spray can etching primer at any paint and body supply store for less than $5 a can.

Remington

 

[runamok151]

that's what i was thinking, thanks. a quick sand and primer before the liner