Gentlemen;
All gaskets leak/seep a little due to vibration and tempature changes on cast iron engines. It's just the 'nature of the best'.
When aluminum engines were introduced they had precision surfaces and the heat/cold was 'even' throughout the engine in comparsion.
Over the years most mechanics have used sealers sparingly in case the engine had to be worked on later.
A few years back, I needed to use 3 different ones/types to change heads on a Ford V-8, as each had a different (specific) application.
I'm not familar with the brands mentioned, but BE SURE your using the proper one for the right application, as they can cause more harm than good.
Chevy six sideplates have always leaked a little.
Good luck to all.
PS: In this case; use the sealer to seal the rubber gasket to the block & brake grease (hi temp) on the side plates. This will allow them (aluminum) to move alone W/O tearing the gasket loose. There are two different materials here.
If you have to remove the plates for inspection later the gasket will stay in place & not need replacement.