[Lona]

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?

Glen