Tracy White wrote:
Modern subs* are totally black, with no red antifouling.
* as off a few years ago; I don't know the exact date.
I think Tracy is right. At some point (late 1990's?) the whole boat was painted black.
I got out of the USN in 1995 and took the USS Alexandria SSN-757 through NewCon in 1989-1991. And she had red anti-fouling paint. But, as I was transferring off of her, there was mention that later after commissioning (maybe a year or two) she was going to get a rubber hull coating. Which I believe is applied as thin tiles of rubber all over the hull. (as a sound isolating material) I'm not sure if the whole hull got this rubber layer, or not, but I'd think that the need for an anti-fouling paint would be eliminated. I think that beginning with the Seawolf class, this rubber layer was standard upon construction.
As far as the bottoms of the stern planes...........I'd have to guess that they are black, as well. And it may vary from boat to boat. I've been in the drydocks under three different boats, and I just can't remember what color these were under the stern planes.
Here are a couple of examples of pre-1995 (let's say) hull paint schemes.
USS Miami SSN-755 in 1994
Note the difference in color/tint at the waterline and the red paint ending at the tangent to the curved hull. The sonar domes were made of fiberglass and may have a different texture but still quite smooth, if not more smooth than than the rest of the hull.
I'm not sure which ship this is. I know that the Augusta had trouble with hitting things with her sonar dome and maybe the Greenville as well.