Here's the proof.
Here is the bare cylinder. Sorry for the poor pic. In the images that follow, you'll see evidence of RTV/sealant that was applied only to the left hand side of the cylinder face. You will also see the leak path, which is very visible here, from the cylinder to the coolant passage / coolant jacket.
The blue area shown here is where RTV / sealant remained on the face of the cylinder housing. The areas where it is not visible are due to bad photography, or that they have stuck to the gasket upon removal. The sealant is a rubbery, RTV-like film. It is thin in most spots, grayish in color, and had to be carefully scraped from the cylinder during repair.
The following image shows a pink area that represents the very visible leak path shown in the first picture. Though there is a lot of black colored residue on the cylinder in this example, most of the black residue is from the gasket coating. However, in the area denoted below, this darker color was carbon deposit- completely different in composition than anything else surrounding the cylinder and water jacket, except where the gasket is normally not sealed. In this area it is identical.
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