Can you identify exactly where the leak is originating?
The SC has a pressure switch down on the firewall that is used to trigger the ARC system...auto shocks. These are common leakers when they they get old. They are generally below the master cylinder, and can make it appear that's the leak source. There were hard to find for a while, but I think they've come back on the market, recently. The switch itself leaks thru the connector body.
As well, the seal on the hydraulic pump motor can fail over time - it sits on the master cylinder assembly, right below everything else. Replacements aren't common, but some have used a Honda part, as I recall.
Another leak source is the o-ring on the accumulator. This seal can be sourced without too much trouble, just be sure to get the right type - info here via search.
I haven't seen general leaks from the master cylinder body itself, but I'm sure they can happen.
The difficulty in re-sealing the 'assembly' might be more about finding a kit, I think.