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09-26-2011, 07:25 PM
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#1 |
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Registered User
Join Date: Jun 2011
Location: Monroe, WI
Posts: 1,415
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Sandblast or POR15
So here is my predicament I just degreased and powerwashed my framerail today and turns out what I thought was surface rust was just grime and 85% of the rail is still covered in the factory paint. The other 15% not covered I either power-washed off when I got to close or is light surface rust and could be hand-sanded off. SO.... I already own the equipment and material to sandblast the entire frame and I already have POR-15, Do I take the time and blast the frame and take off the factory paint and start from bare metal and then POR-15 it, or do I just sand the factory paint to scuff it up and sand off any of the remaining rust and POR 15 the frame? Any thoughts or other ideas. On a side note it is not in my budget to pay someone to powder coat the frame as nice as that would look...
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09-26-2011, 08:06 PM
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#2 |
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Registered User
Join Date: Sep 2010
Location: none
Posts: 239
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Re: Sandblast or POR15
how bout hitting major problem areas only with the sandblast and then scuffing the rest? sandblasting the whole thing is a biotch, trust me, i know. ive done it. at least with the cab on it is..... in the snow.... with an underpowered 13horse compressor, and a ****ty eastwood sand pod. good luck suckuh!
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09-26-2011, 09:03 PM
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#3 | |
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Registered User
Join Date: Jun 2010
Location: San Diego Co.
Posts: 1,157
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Re: Sandblast or POR15
Quote:
You must follow the directions...EXACTLY in order for it to perform. Part of that (I believe) is applying it to bare metal. So if you want to use it, you should blast the whole thing. And since you already have everything you need, maybe you should just go for it...blast it all, then POR. Alternatively, you could just scuff up the factory, blast/sand the surface rust, and then just prime/paint the frame. I,e. not use the POR. I'm sure others with experience will chime in.....good luck. |
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09-26-2011, 09:13 PM
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#4 |
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Registered User
 
Join Date: May 2007
Location: Rapid City South Dakota
Posts: 2,359
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Re: Sandblast or POR15
As they say..."anything worth doing, is worth doing right!" If you are going through the trouble of a frame off, blast it to bare metal, and then do the POR. If you don't remember anything else anyone tells you, remember this...when your truck is finished, you will never say "I wish I would of half-assed it together."
__________________
Turp Mcspray New life for an old 2wd, farm blazer http://67-72chevytrucks.com/vboard/s...d.php?t=505987 My Blazer build http://67-72chevytrucks.com/vboard/s...d.php?t=342299 |
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09-26-2011, 09:17 PM
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#5 |
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Registered User
Join Date: Jan 2009
Location: San Antonio, Texas
Posts: 1,374
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Re: Sandblast or POR15
Count my vote for blasting the entire frame and then go with the POR-15. I don't think you'll regret giving it the works later.
__________________
1972 C10 LWB, 350/350 Deconstruction began 5/2009, mostly completed restoration, 5/2017 |
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09-26-2011, 10:57 PM
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#6 |
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Registered User
Join Date: Mar 2011
Location: Spokane WA
Posts: 198
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Re: Sandblast or POR15
I just went through a quart of POR 15 over the weekend. Goes on real easy with a brush. If the body is still on the frame (like mine) wear gloves and long sleeves. The directions arent kidding when it says that if you get any on your skin and it dries, you will be wearing it for a few days. It made going to work the next day kinda interesting.
__________________
USCG "Support Search & Rescue, Get Lost" |
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09-26-2011, 11:26 PM
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#7 |
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Registered User
Join Date: Dec 2007
Location: Nanaimo B.C.
Posts: 604
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Re: Sandblast or POR15
isn't por15 paint over rust paint. Why not use a paint that is for bare metal? will the por hold to baer metal good? or dose it need rust to bond right
__________________
I was hooked on these trucks since 1982 when I drove my budys fathers 1968 Custum GMC 396 automatic dana 60 rear with a power lock diff what a ride more fun then we will we can ever tell!! |
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09-26-2011, 11:33 PM
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#8 |
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Senior Member
Join Date: Oct 2009
Location: Godley, TX
Posts: 17,945
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Re: Sandblast or POR15
por 15 will work on bare metal - but you highlight a great question - IF you sand blast the rust, then POR 15 really shouldn't be necessary - you can simply apply chassis paint. On the other hand, POR 15 will probably last longer. Kinda like FOREVER, so not sure that is always a good thing. But either way - agree with the folks that recommend blasting first. I would not think POR 15 would work very well over scuffed paint. My 2c.
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09-27-2011, 12:03 AM
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#9 |
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Registered User
Join Date: Mar 2011
Location: Spokane WA
Posts: 198
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Re: Sandblast or POR15
When I ran across some spots with paint, the POR 15 wouldnt adhere to it all.
__________________
USCG "Support Search & Rescue, Get Lost" |
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09-27-2011, 01:45 AM
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#10 |
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Registered User
Join Date: Feb 2011
Location: A****er ca
Posts: 475
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Re: Sandblast or POR15
both
__________________
72 chevrolet 4wd 350/350 swb fleet green mean army machine 
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09-27-2011, 07:53 AM
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#11 |
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Just a car guy
Join Date: Feb 2006
Location: New Washington, IN
Posts: 991
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Re: Sandblast or POR15
When painting non rusted metel with por15, you must first use there etching wipe.
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1955 belair Blown Pro Street cruiser 1971 Camaro Pro Touring 1973 Vega Drag Car 1970 C20 tow rig |
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09-27-2011, 08:42 AM
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#12 |
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Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Sandblast or POR15
dont use POR15 on painted surfaces it will not go on good or last goodly
__________________
71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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09-27-2011, 10:58 AM
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#13 | |
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Moderator
 
Join Date: May 2007
Location: Southern Cal
Posts: 19,995
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Re: Sandblast or POR15
Quote:
__________________
1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
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09-27-2011, 02:00 PM
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#14 |
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Registered User
Join Date: Jun 2011
Location: Monroe, WI
Posts: 1,415
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Re: Sandblast or POR15
Looks like I will be pulling the motor and trans and all the lines off on thursday night and Blasting on Friday! Which leaves Sat. to Paint! Thanks for all the input!
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09-27-2011, 07:45 PM
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#15 | |
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Registered User
Join Date: Jan 2011
Location: norton va
Posts: 12
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Re: Sandblast or POR15
Quote:
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09-27-2011, 09:05 PM
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#16 |
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Old Skool Club
Join Date: Jun 2001
Location: Benton, AR "The Heart of Arkansas"
Posts: 10,880
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Re: Sandblast or POR15
I had mine sandblasted, then we painted it with some black low-gloss paint from Tractor Supply, with a hardener added. I feel good about it.
__________________
Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was. |
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10-10-2011, 12:39 AM
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#17 |
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Registered User
Join Date: Feb 2011
Location: A****er ca
Posts: 475
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Re: Sandblast or POR15
i hate to do this but
 we need frame pics
__________________
72 chevrolet 4wd 350/350 swb fleet green mean army machine
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10-10-2011, 02:59 AM
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#18 |
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Registered User
Join Date: Sep 2011
Location: Hilo, Hawaii
Posts: 1,051
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Re: Sandblast or POR15
Wire brush.. Soak with kbs clean and kbs it! It's a lot easier and cheaper than por15.... Imho - holds up just as good! I have used both but like the kbs better
Posted via Mobile Device
__________________
Frank (Hilo, Hawaii) Trucks, Tacos, and Beer go together like Peanut Butter and Ladies!  85 C/10 SOLD http://67-72chevytrucks.com/vboard/s...d.php?t=760383 67 C/10 SOLD http://67-72chevytrucks.com/vboard/s...d.php?t=489298 79 K5 Blazer SOLD http://67-72chevytrucks.com/vboard/s...d.php?t=657461 |
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10-10-2011, 08:25 AM
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#19 | |
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Registered User
Join Date: Dec 2009
Location: Brooklyn N.Y.
Posts: 819
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Re: Sandblast or POR15
Quote:
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1967 GMC Suburban, Supercharged 6.2 LS with a 6l80e , my 11 second tow vehicle! *pic in my profile* 1987 GMC CrewCab Dually 6.0 LS/6L90e, new tow pig. http://67-72chevytrucks.com/gallery/...=74049&cat=500 |
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10-10-2011, 10:22 AM
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#20 | |
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Registered User
Join Date: May 2007
Location: LOUISIANA
Posts: 811
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Re: Sandblast or POR15
Quote:
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James '68 Stepside (ground up in progress) My 68 build thread http://louisianaclassictruckclub.fre...side-t956.html '81 SWB "Pap paw" (Driver) The 81 build thread http://louisianaclassictruckclub.fre...-swb-t960.html Member of www.louisianaclassictruckclub.com https://www.facebook.com/groups/296290610747732/ |
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10-10-2011, 01:02 PM
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#21 | |
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Registered User
Join Date: Dec 2009
Location: Brooklyn N.Y.
Posts: 819
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Re: Sandblast or POR15
Quote:
__________________
1967 GMC Suburban, Supercharged 6.2 LS with a 6l80e , my 11 second tow vehicle! *pic in my profile* 1987 GMC CrewCab Dually 6.0 LS/6L90e, new tow pig. http://67-72chevytrucks.com/gallery/...=74049&cat=500 |
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10-10-2011, 03:45 PM
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#22 |
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Registered User
Join Date: Jun 2011
Location: Monroe, WI
Posts: 1,415
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Re: Sandblast or POR15
Here is the framerail before blasting... I have started blasting but have not finished... I will post photos after blasting...and after POR 15
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10-10-2011, 03:05 AM
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#23 |
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~Rest In Peace~
Join Date: May 2005
Location: CALIFORNIA NOR CAL
Posts: 9,707
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Re: Sandblast or POR15
anytime you can sandblast and take it down and repaint the frame. powdercoated it too
__________________
is it fast ? it has a lighting bolt donut? B___H please, I can remove 90% of your so called "beauty" with a kleenex |
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10-10-2011, 10:32 AM
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#24 |
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Registered User
Join Date: May 2007
Location: Rapid City South Dakota
Posts: 2,359
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Re: Sandblast or POR15
Por and its variants, are whats called "moisture cured urethane". They work excellent over sandblasted surfaces. They require a rough surface to properly adhere. Yes POR stands for "paint over rust" but when you apply the metal etch, that product is left on the surface for the por to stick to. It isn't actually touching the rust. The name is a little misleading.
Moisture cured urethanes have been around for a very long time. Originally designed for bridges, water pipes etc, that would spend their lives subject to an extreme enviornments. Someone came up with the idea to market them to the automotive market, and the rest is history, as they say.
__________________
Turp Mcspray New life for an old 2wd, farm blazer http://67-72chevytrucks.com/vboard/s...d.php?t=505987 My Blazer build http://67-72chevytrucks.com/vboard/s...d.php?t=342299 |
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10-10-2011, 11:35 AM
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#25 |
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Registered User
Join Date: Jun 2007
Location: Lethbridge, AB
Posts: 234
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Re: Sandblast or POR15
When I built my 68, I sandblasted the complete frame, and then applied POR 15. That is what I would recommend as it worked great! and I guarantee would last for a very very long time. It can be a bit of a pain sandblasting the whole frame if you don't have the right equipment, but if you can get your hands on it, and take the time to do it it'll more than pay off in the long run. Just my two cents
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