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| | | | Joined: Aug 2012 Posts: 1,214 Shop Shark | | Shop Shark Joined: Aug 2012 Posts: 1,214 | Exploring options on painting the interior of my 49 3100. It's currently bare and I'm thinking on doing some painting before I reinstall the tank.
I do have a small patch to weld in on the passenger side toe board but otherwise the interior metal just has minor surface rust.
I know POR 15 will cover light rust and can be painted over.
Anyone use it for that purpose or is std primer the preferred method?
Dave
| | | | | Joined: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 |
POR will nicely cover/seal/stop rust, but using it as a primer has at least one down-side. Your "time-window" for over-coating is more limited than when using other primers.
| | | | | Joined: Dec 2001 Posts: 1,248 'Bolter | | 'Bolter Joined: Dec 2001 Posts: 1,248 | I don't know if they still recommend do this or not. Use to POR-15 recommended spraying a light coat of lacquer over the POR-15 when it was just tacky to the touch. Was suppose to give you something to top coat to then......
John | | | | | Joined: Jul 2005 Posts: 308 'Bolter | | 'Bolter Joined: Jul 2005 Posts: 308 | I think it is good stuff, make sure you cover your skin when painting or you will have to let it wear off. If using a spray gun use a good respirator.
Ed | | | | | Joined: Jun 2011 Posts: 1,901 Shop Shark | | Shop Shark Joined: Jun 2011 Posts: 1,901 | Exploring options on painting the interior of my 49 3100. It's currently bare and I'm thinking on doing some painting before I reinstall the tank.
I do have a small patch to weld in on the passenger side toe board but otherwise the interior metal just has minor surface rust.
I know POR 15 will cover light rust and can be painted over.
Anyone use it for that purpose or is std primer the preferred method?
Dave I prefer epoxy or even rustoleum personally... ever try taking POR off???
Give me ambiguity
or give me something else
| | | | | Joined: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 |
CASO,
Would you apply epoxy primer directly over what Dave describes?
| | | | | Joined: Jun 2011 Posts: 1,901 Shop Shark | | Shop Shark Joined: Jun 2011 Posts: 1,901 | I took the wire wheel on a drill extension to the back of my dash and gave it 2 or 3 coats of epoxy. It's not like there was anything more than surface rust back there and it was good for another 30 yrs as it was. I figure epoxy was overkill there. Where I could get my sand paper I did. The rest of my cab was good except the corners and front fender wet spot. With the salt water test that was done on the epoxy I see no reason not to go that route. One product easily sandable, accepts paint/filler. As for Rust, as long as the ospho is neutralized properly you can go over it. whats not to like? and again... ever try taking POR OFF? OK. POR is great for covering up Rust. Nothing Better. there I said it... Yuh Happy?  (ever try taking that stuff off?)
Give me ambiguity
or give me something else
| | | | | Joined: Jul 2005 Posts: 308 'Bolter | | 'Bolter Joined: Jul 2005 Posts: 308 | Caso,
Por15 comes out looking really nice and you can beat the area with a hammer and it doesn't come off. Yes POR15 is really hard to get off if you get it on you so that is why protective covering is a good idea.it does a lot more than just cover rust, it helps keep the rust from coming back.
Ed | | | | | Joined: Jun 2011 Posts: 1,901 Shop Shark | | Shop Shark Joined: Jun 2011 Posts: 1,901 | Ed It's not me I have an issue with getting it off. Its the truck. The next guy who has to take it off isn't going to be happy. (He'd be even more [censored] at having to remove tar though)  IF you could paint over it I'd be easier on it... but it needs a special prep for 'smooth' metal an extra coat of something else to make it paintable. Its never sandable you can't feather it and it costs more than epoxy primer... Works GREAT on RUST!!! OK for frames I guess, (if they're rusty) but I'm doing a restoration not encapsulation... 
Give me ambiguity
or give me something else
| | | | | Joined: Feb 2011 Posts: 1,363 'Bolter | | 'Bolter Joined: Feb 2011 Posts: 1,363 | POR is not UV protected either, so if in the end you want a chalky looking frame then use it. Even krylon is better than what the factory painted parts with. Epoxy is great as long as parts are clean, no old paint. It doesn't look like parts were primed, just a quick look good paint job from the factory.
Kicking self for selling off my Taskforce trucks.
Still looking for an LCF or conventional big bolt in decent shape.
As of 10-26-2022, A 55.2 Taskforce long bed now the work begins
| | | | | Joined: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 |
As I posted above, POR can easily be painted over as long as it is done within the time-window described in the instructions.
We have also sanded it (after it has set/cured) and then used a PPG sealer/surfacer before painting with PPG DCC urethane. It has lasted nicely for over 10 years on the roof of my Suburban. This application was out of desperation - the roof was heavily pitted. All paint had been removed and all rust had been removed - we were still worried about the pitted metal.
We will soon be using it on my COE's frame. One coat POR, followed by a coat of PPG DCC urethane black with a little flattener.
As posted above, POR is messy stuff. Also, you have to carefully follow the instructions.
| | | | | Joined: Jul 2005 Posts: 308 'Bolter | | 'Bolter Joined: Jul 2005 Posts: 308 | If done properly the next owner shouldn't have a need to remove it.
Ed | | | | | Joined: Aug 2012 Posts: 1,214 Shop Shark | | Shop Shark Joined: Aug 2012 Posts: 1,214 | Good info. I like POR 15 for surfaces that are exposed to the elements and I like it's ability to be applied directly to light rust.
What are the other options of priming and finishing up w/a nice finish coat without having to sand/strip the cab interior down to bare metal?
I'm mainly talking about the sides, floors, roof etc., I'm leaning towards std primer and finish paint for the dash.
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