POR15 Engine Paint - Surface Prep - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Rakort · 08-10-2007, 08:06 AM

I'm getting ready to paint my engine and I need to decide between the spray bomb route and something like POR15. It seems POR15 wants the painted surface to be down to metal with none of the previous paint left on the surface. NO problem with the heads as those I will be glass beading, but not so for the block. Not very realistic to get all the old paint off of the block. What experience has everyone had with applying a POR15 product over existing paint?

Thanks
Brian

prg machine · 08-10-2007, 12:01 PM

I had a hard enough time with it on my bare block(chevy orange por15). It wanted to wrinkle and sag when brushed on. It was extremely thick. I thinned with laquer thinner and it worked a whole lot better. In the long run it is probably worth it. I have heard of a bad batch that came out and gave troubles, was it what I got,,,,I don't know for sure. It is extremely tough when dry though. I have a feeling it will outlast spray bomb for sure.
I would think you need bare metal, but maybe just try a spot and see.

Sinister · 08-10-2007, 12:10 PM

I can't remember, cause it's been a while, but I think I used carb cleaner to get the paint off a motor once...

70c10 · 08-10-2007, 12:37 PM

Engine just needs to be grease free according to their directions.
http://www.por15.com/Data%20Sheets/e...directions.pdf

Scott68-93-97 · 08-10-2007, 01:29 PM

Use POR 15 prep kit and if you leave your old paint they have a primer that works with there stuff

Sinister · 08-10-2007, 06:07 PM

Quote:

Originally Posted by Sinister

I can't remember, cause it's been a while, but I think I used carb cleaner to get the paint off a motor once...

I was looking through my old posts and found one, where I did use carb cleaner to take the paint off a block...

SCOTI · 08-10-2007, 09:17 PM

Carb cleaner might remove the old paint, but it also leaves a residue that the new paint won't like.

Oven cleaner will take most old paint off or go to your local parts house (Oreillys or Autozone in my area) & get some 'aircraft' stripper. It will remove the old paint.

Sinister · 08-11-2007, 12:01 AM

Quote:

Originally Posted by SCOTI

Carb cleaner might remove the old paint, but it also leaves a residue that the new paint won't like.

New paint stuck alright...

SCOTI · 08-11-2007, 12:10 AM

Quote:

Originally Posted by Sinister

New paint stuck alright...

I didn't say it would never work but it does leave a residue that will limit adhesion. That's why you don't use carb cleaner to clean a rotor or flywheel; brake cleaner works better.

68,69 K20 · 08-11-2007, 10:28 AM

I was painting a pair of valve covers recently, They had several layers of paint on them. I found a spray can of decal and paint stripper at my local auto parts place. The stuff worked great, required some time to scrape layers of paint as they dissolved but the stuff absolutely ate up paint. As far as the residue goes they make cans of pre-cleaner to clean all surfaces of any remaining residues, I believe lacquer thinner will also remove them. It will take a little more effort to remove it from the block but I think you will be much happier with the outcome than trying to paint over old existing paint.

HavinSomeFun · 08-11-2007, 02:03 PM

so where do you buy this POR15 and prep kits?

Rust Buster · 08-11-2007, 02:37 PM

I was the guy that got a bad batch. I was told that the bad batch had yellow stickers on it. So check your cans.
It works 500% better if you spray, brushing was an absolute nightmare. I took mine all the way to bare metal and then used lacquer thinner. In the end it came out great.

Sport/Truck · 08-13-2007, 09:52 PM

Quote:

Originally Posted by HavinSomeFun

so where do you buy this POR15 and prep kits?

I got mine at the store where they sold the POR 15.

Sport/Truck · 08-13-2007, 09:55 PM

Quote:

Originally Posted by Rust Buster

I was the guy that got a bad batch. I was told that the bad batch had yellow stickers on it. So check your cans.
It works 500% better if you spray, brushing was an absolute nightmare. I took mine all the way to bare metal and then used lacquer thinner. In the end it came out great.

Glad to hear yours turned out ok….after reading your story & seeing the pictures it wasn’t looking good.

s/t

HavinSomeFun · 08-13-2007, 10:54 PM

Quote:

Originally Posted by Sport/Truck

I got mine at the store where they sold the POR 15.

Thanks for being so helpful, Thats what I like about these type forums.

68chevy68 · 08-14-2007, 12:24 AM

JUST REMEMBER THAT IT TAKES LIKE 8 DAYS TO CURE. It freaked me out when I did mine, thougth I had some bad paint. Give it a good coat and let it tack up some and spray it again. I only gave mine one cause like I said, thought it was bad. lol

08-10-2007, 08:06 AM	#1
Rakort Registered User Join Date: Jul 2001 Location: Neenah, WI Posts: 327	POR15 Engine Paint - Surface Prep I'm getting ready to paint my engine and I need to decide between the spray bomb route and something like POR15. It seems POR15 wants the painted surface to be down to metal with none of the previous paint left on the surface. NO problem with the heads as those I will be glass beading, but not so for the block. Not very realistic to get all the old paint off of the block. What experience has everyone had with applying a POR15 product over existing paint? Thanks Brian __________________ Rakort Parts for Sale: Pictures Awesome Elec. Schematic Available: Picture Awesome Elec. Schematic Available: Picture

08-10-2007, 12:01 PM	#2
prg machine Registered User Join Date: Jun 2007 Location: oregon Posts: 1,069	Re: POR15 Engine Paint - Surface Prep I had a hard enough time with it on my bare block(chevy orange por15). It wanted to wrinkle and sag when brushed on. It was extremely thick. I thinned with laquer thinner and it worked a whole lot better. In the long run it is probably worth it. I have heard of a bad batch that came out and gave troubles, was it what I got,,,,I don't know for sure. It is extremely tough when dry though. I have a feeling it will outlast spray bomb for sure. I would think you need bare metal, but maybe just try a spot and see.

08-10-2007, 12:10 PM	#3
Sinister Between Trucks... Join Date: Mar 2002 Location: Los Angeles, CA. Posts: 3,830	Re: POR15 Engine Paint - Surface Prep I can't remember, cause it's been a while, but I think I used carb cleaner to get the paint off a motor once... __________________ Beat it to fit, Paint it to match...

08-10-2007, 12:37 PM	#4
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,857	Re: POR15 Engine Paint - Surface Prep Engine just needs to be grease free according to their directions. http://www.por15.com/Data%20Sheets/e...directions.pdf __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

08-10-2007, 01:29 PM	#5
Scott68-93-97 Registered User Join Date: Jul 2006 Location: Fair Oaks, CA Posts: 475	Re: POR15 Engine Paint - Surface Prep Use POR 15 prep kit and if you leave your old paint they have a primer that works with there stuff __________________ 1968 Short Fleet 350/700r4 http://67-72chevytrucks.com/vboard/s...d.php?t=249435 1997 Bagged XtdCab Vortec350/4L60e http://67-72chevytrucks.com/vboard/s...44#post2286144 1993 XtdCab Longbed 4x4 6.5Turbo/NV4500 "Daily Driver" 1985 Toyota XtdCab 4x4 22re/W-56/Dual T-cases, Doug Thorley Header, Homebrew front and rear spring packs, Tons of Mods to suspension and drivetrain, 35" boggers, coming soon ARB's and 5.29's, Possible 4.3/700r4 swap Last edited by Scott68-93-97; 08-10-2007 at 01:29 PM.

08-10-2007, 09:17 PM	#7
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 21,923	Re: POR15 Engine Paint - Surface Prep Carb cleaner might remove the old paint, but it also leaves a residue that the new paint won't like. Oven cleaner will take most old paint off or go to your local parts house (Oreillys or Autozone in my area) & get some 'aircraft' stripper. It will remove the old paint. __________________ 67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... *Cubic inches is like Indiana Jones with a cheap pistol.* Last edited by SCOTI; 08-10-2007 at 09:17 PM.

08-11-2007, 10:28 AM	#10
68,69 K20 They call me the Breeze... Join Date: Jul 2007 Location: New York Posts: 2,251	Re: POR15 Engine Paint - Surface Prep I was painting a pair of valve covers recently, They had several layers of paint on them. I found a spray can of decal and paint stripper at my local auto parts place. The stuff worked great, required some time to scrape layers of paint as they dissolved but the stuff absolutely ate up paint. As far as the residue goes they make cans of pre-cleaner to clean all surfaces of any remaining residues, I believe lacquer thinner will also remove them. It will take a little more effort to remove it from the block but I think you will be much happier with the outcome than trying to paint over old existing paint. __________________ Mike 69 K20 "Beer is proof God loves us and wants us to be happy"....Ben Franklin

08-11-2007, 02:03 PM	#11
HavinSomeFun Still Just Havin Some Fun! Join Date: Jun 2007 Location: Piedmont, Oklahoma Posts: 1,145	Re: POR15 Engine Paint - Surface Prep so where do you buy this POR15 and prep kits? __________________ a green one with some stuff done to it....

08-11-2007, 02:37 PM	#12
Rust Buster Registered User Join Date: Apr 2007 Location: Virginia Posts: 547	Re: POR15 Engine Paint - Surface Prep I was the guy that got a bad batch. I was told that the bad batch had yellow stickers on it. So check your cans. It works 500% better if you spray, brushing was an absolute nightmare. I took mine all the way to bare metal and then used lacquer thinner. In the end it came out great. __________________ Maj USAF 71 K5 Blazer CST 72 K20 HT383 NV4500 Mass-Flo EFI 71 K10 LWB 52 Dodge Power Wagon 67 Dodge WM300 Power Wagon 48 Dodge WDX Power Wagon My Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=239487

08-14-2007, 12:24 AM	#16
68chevy68 Registered User Join Date: Apr 2007 Location: arkansas Posts: 524	Re: POR15 Engine Paint - Surface Prep JUST REMEMBER THAT IT TAKES LIKE 8 DAYS TO CURE. It freaked me out when I did mine, thougth I had some bad paint. Give it a good coat and let it tack up some and spray it again. I only gave mine one cause like I said, thought it was bad. lol __________________ http://67-72chevytrucks.com/vboard/s...d.php?t=245203



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