I use to use Glyptal on my inner engine surfaces to suspend any contaminates and improve oil flow.  One place I never used it was the oil pan,  no particular reason.  I read somewhere it would retain heat in the block not sure I agree with that.  Also read Smoky Yunick used it in his ports to smoothen the flow since no porting was allowed. Of course then it got banned.  
I know folks will say it will eventually peel off but properly cleaned surfaces have yet to cause any problems.  
I would like to hear and success of failures storys   
Thanks,
Richard

Used it all the time in the rebuilding of starters, alternators and generators.

Coated many an armature ,stator and field coils with never any issues.

Like to hear from other folks on different applications.

Oldmics

Ford used glyptal on the interior of the 9” third member housings.  Never saw one with peeling paint even after sixty years of use.

Lorena, Texas (South of Waco)

What is the color on the outside of the 9". Its very much like the Glyptal?

Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.

MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire

I have used Glyptal for over 45 years in the electrical power plants and found it to stick to just about anything clean. There are deflectors or baffles on the ends of many electric motors which are about the same thickness of a oil pan I have never seen any flacking of the coating.

However I have never painted any of my racing oil pans with it even tho all my engine crankcases are coated with it. I do have my pans gold irridated (I've probably got the name and process wrong ) like the ones Moroso valve covers did for years. It is very easy to clean and I never need to worry about flaking particles on the screen. Also those sticky back sheet heaters adhere well to it on the outside.

56 Vic, B'Ville 200 MPH Club Member, So Cal.