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Old 05-30-2012, 10:17 AM   #1
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How Much POR 15

So does any one know about how much POR 15 I will Need to coat my 28' Ambassador frame? The stuff isn't the cheapest so I really don't want a ton of extra. And can you spay it on? I know if I do it will take more.
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Old 05-30-2012, 10:30 AM   #2
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You cannot spray it on. The best I can see, is each pint covers 12 sq. feet, so you'll have to do the math. They make a "six pack" that covers 72 sq. feet that looks like the best idea, so you can take those important rest breaks. Let us know how it works out, a friend has used it and swears by it! Remember, like a lot of great things in life, it's "stirred, not shaken".
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Old 05-30-2012, 10:38 AM   #3
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So does any one know about how much POR 15 I will Need to coat my 28' Ambassador frame? The stuff isn't the cheapest so I really don't want a ton of extra. And can you spay it on? I know if I do it will take more.
You can spray it, its just a big PITA. Brush application works great. Be sure to cover up as this paint bonds to iron pretty much permanently. Since you have iron in your blood (unless you are a Vulcan) it will be on your skin til your skin flakes off. I used a bit less than a gallon. I also used Por 15 hardnose for any part of the frame exposed to UV. It is very UV sensitive and requires a top coat.
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Old 05-30-2012, 10:50 AM   #4
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I suppose you could use a sprayer, but I notice in my catalog they offer no spray cans.
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Old 05-30-2012, 12:22 PM   #5
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A $25 HVLP (high-volume low-pressure) gravity fed spray gun from Harbor Freight did a very nice job on my 27' frame, as well as turning my driveway bright silver. A full face respirator with correct cartridges worked well - although now their lawyers have modified requirements to remote-source air supply. Brushing exposes you to more vapors for a longer time.

I used two quarts and thinned it down per instructions spraying. And, I brushed on two quarts, thinned down, three years ago and learned some things the first time. More to the story here. You can see where the black POR bonded and didn't bond the first time I painted - when it bonds correctly even an angle grinder with gnarly abrasive disc mostly bounces off

The factory paint is an asphalt based waxy coating that will poison-load up most abrasive pads you could use to strip it off - an angle grinder with twisted-bristle wire brush 'slung' it away nicely but still left an oily layer that needed two and three solvent wipes to get to bare metal, and even then any microscopic pits still hold the yellow-brown wax.

Even with the solvent wiping the silver POR-15 came up with a yellowish hue to it from floating up traces of the original paint. I found the aerosol B-12 Chemtool Carburetor, Choke and Throttle Body Cleaner worked extremely well - caught it on sale for eight cans at $2 each... That and a two rolls of paper towels. Respirator mandatory.

I got the POR-15 thinner, good stuff and worth it, even cleaning the spray gun, etc. and it both stretches the brushed on POR and extends the cure time.

Attachment is twisted-bristle brushes, right one has lost its magic. Goggles, gloves and eat your spinach as your wrists & grip will be tested if you do it correctly. Beg or borrow a magnetic sweeper, I wore a bristle needle under my skin on my back for three days from wiggling over one after-the-fact.
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Old 05-30-2012, 04:39 PM   #6
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Hey thanks for all the info. Wabbiteer, your thread is great lots of good info. I just need to get mine done in a month and a half or will be borrowing friends AS again.

I don't think there is any paint left of the frame, looks like a lot of surface rust. And it has spray on foam insulation underneath. So i'm guessing it was protected under that, or maybe not will find out in the next few days. Is there another product that works like POR15 just wondering..?

I have my gantry's that I will use to flip the frame around to take the rust off and paint. done laying on my back..
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Old 05-30-2012, 05:33 PM   #7
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Is there another product that works like POR15 just wondering..?
Just talked with my friend who restores vintage rigs; he says don't bother to shop around.
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Old 05-30-2012, 06:00 PM   #8
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Ok thanks mike. It's a done deal then. 4 quarts is on sale for $167.
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Old 05-30-2012, 07:40 PM   #9
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POR-15 is the only way to go, we use it on cars, trucks, tractors, boats AND Airstreams We usually thin ours a bit and use foam rollers and brushes.

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Old 05-30-2012, 08:18 PM   #10
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Jason, email Frank (62overlander) and ask him about how he sprays Por-15. He's posted some photos and it looks amazing. Granted you won't see most of your work in the end, but spray likely will get a much more effective coat.
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Old 06-01-2012, 03:43 PM   #11
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They do make it in a spay can now. And UV doesn't affect it. $21 for 14 oz not cheap
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Old 06-01-2012, 05:33 PM   #12
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Extraordinary claims require extraordinary proof

Are you seeing their aerosol blackcote? It is a close cousin sold as non-porous top coating. I don't believe we'd get the corrosion undercutting protection from it - maybe allow blisters to hold moisture next to iron versus the POR15 bonding strong enough rust won't creep under it on gouges or missed pits on welds etc...
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Old 06-01-2012, 05:42 PM   #13
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I no longer use a brush, because I always spray it now. I use a siphon feed cup gun @ 28 psi thinned out 10% with zylene. It goes on even and smooth. Spraying it also increases the coverage by a lot.
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Old 06-01-2012, 08:16 PM   #14
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Hey ... Is there another product that works like POR15 just wondering..?..
I have used POR15 and this stuff...


Rust Solutions - Specialty Coatings

It seems the Eastwood rust encapsulator is a bit cheaper if I remember correctly. It sprays very nice and doesn't seem to be as picky about UV exposure. It's been on there for over a year with no top coating on the exposed areas...so far so good.

http://www.airforums.com/forums/f109...tml#post966651
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