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Old 09-09-2015, 03:02 PM   #1
Curt Campbell
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Default Glycol for Painting Inside of Engine

Any recommendations on whether or not use Glyptol or similar coating to coat insides of engine etc? I know Eastwood sells it.

Thanks in advance.
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Old 09-09-2015, 03:06 PM   #2
1931 flamingo
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Default Re: Glycol for Painting Inside of Engine

Try doing a search. This has been discussed previously. Some say yes, some say no.

Paul in CT
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Old 09-09-2015, 03:25 PM   #3
Dollar Bill
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Default Re: Glycol for Painting Inside of Engine

Adhesion is the greatest concern. You would need to bake the block in order to remove all the oil that has permeated the pores of the casting. Coating the lifter valley with Glyptal was once a racer trick to improve oil return to the sump. Hard to justify the delamination risk for a Model A.
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Old 09-09-2015, 03:37 PM   #4
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Default Re: Glycol for Painting Inside of Engine

Redi strip chemical stripping is what I've always used when building engines.
When the casting is spotless and only then, are ready to paint.
If you have any doubts about it being clean enough, don't paint it.
The last thing you want is paint peeling off in strips and plugging up the pump.
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Old 09-09-2015, 03:46 PM   #5
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Default Re: Glycol for Painting Inside of Engine

My '31 roadster with a '30 engine has a brick color inside the engine block and the valve chamber with no chipping or delamination anywhere. I assume it is Glyptol but can't be sure. I don't think this was done at the factory so it must have been applied when the engine was rebuilt some years ago. My understanding is that it helps prevent seepage of oil through the pores in the metal casting and helps oil move throughout the system. I agree that unless you did a really thorough cleaning, you would be better off just going with the bare casting. Why take the chance of ending up with poor adhesion and paint chips floating around inside your engine?

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Old 09-09-2015, 04:21 PM   #6
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Default Re: Glycol for Painting Inside of Engine

Painting anything with Glycol would be a challenge.

That being said, my engine was painted with a red substance I assume is Glyptol. As far as I can tell, it has held up really well. Can't say that about the rest of the engine, but then that's another story altogether.
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Old 09-09-2015, 06:24 PM   #7
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Default Re: Glycol for Painting Inside of Engine

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Originally Posted by Curt Campbell View Post
Any recommendations on whether or not use Glyptol or similar coating to coat insides of engine etc? I know Eastwood sells it.

Thanks in advance.
No because you'll never get it clean enough for the paint to adhere.
Here are two perfect examples. One Model A; with paint coming off in lifter gallery and other Pontiac engine; with paint chips plugging the oil pump screen.
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Old 09-09-2015, 06:47 PM   #8
Ron in Quincy
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Default Re: Glycol for Painting Inside of Engine

I use a red epoxy insulating enamel for interior of engines, armatures in starters and generators, inside distributors, and inside Zenith and Holley Carburetors; it penerates, coats and seals in one operation; it is oil and gas resistant; when wet 1200V when dry 2100V. It comes in a spray can so makes it very easy to use.

I learned of this product from a business here in Quincy, CA, Holloway Engineering who rebuilds airplane Radial engines, and is noted for his quality all over the world; the interior of some of these engine cases were original painted with Glyptol, Holloway uses this epoxy on the interior cases of these rebuilt engines, also uses it when rebuilding starters and other electrical items.

The product is available from: Aervoe Industries Inc. in Gardnerville, Nevada, Some time ago I spoke to Jeff Weaver in Customer Service 1-800-237-0196; the product is 401 Red, you have to buy a case at a time which contains 12ea. 16 oz. spray cans, the cost was $83.25 plus shipping.

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Old 09-09-2015, 07:26 PM   #9
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Default Re: Glycol for Painting Inside of Engine

Quote:
Originally Posted by Curt Campbell View Post
Any recommendations on whether or not use Glyptol or similar coating to coat insides of engine etc? I know Eastwood sells it.

Thanks in advance.
go to the source for info, supply and recommendation.

http://www.glyptal.com/glyptal_home.html
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Old 09-09-2015, 08:22 PM   #10
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Default Re: Glycol for Painting Inside of Engine

Adhesion concerns outway any real benifits. Don't do it.
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Old 09-09-2015, 08:26 PM   #11
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Default Re: Glycol for Painting Inside of Engine

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Adhesion concerns outway any real benifits. Don't do it.
yep bigtime
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Old 09-09-2015, 09:31 PM   #12
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Default Re: Glycol for Painting Inside of Engine

We have taken apart three failed engines with that crap completely plugging up the oil pump screen. My vote is NO!!!

Steve @ Bert's
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Old 09-09-2015, 10:29 PM   #13
al's28/33
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Default Re: Glycol for Painting Inside of Engine

why do something like that which was never done originally ?????

ever heard, "If it ain't broke, don't fix it !"......?
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Old 09-09-2015, 10:39 PM   #14
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Default Re: Glycol for Painting Inside of Engine

We used to do the inside of race motors as it was supposed to help with oil return and to
seal the inside of the motor. I think it was a passing fancy and a monkey see monkey do.
We only did it to race motors as they were torn down on a regular basis and and we could
check up on it. When done correctly it always stayed on even when the motor was pressure washed on a rebuild. We haven't done this to any motors in almost 20 yrs.
We also don't send the oil down from the heads and lifter valley like we used to.
The oil is sucked out with more stages of the scavenge pump and back to the oil tank.
If it makes you feel good do it....
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Old 09-10-2015, 12:24 AM   #15
Chris Haynes
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Default Re: Glycol for Painting Inside of Engine

My block was hot tanked. Nice clean bare metal. I used spray can Glyptol.
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Old 09-10-2015, 09:56 PM   #16
Curt Campbell
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Default Re: Glycol for Painting Inside of Engine

Thanks for the responses guys.
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Old 09-11-2015, 12:37 PM   #17
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Default Re: Glycol for Painting Inside of Engine

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Thanks for the responses guys.
I've used it (glyptol) for engine interior coating for years. Never have had a problem....when used PROPERLY ! IMO, any product can be misused and you will get results commensurate with misuse. For instance, an engine block should be hot tanked , then this product applied to a CLEAN surface.
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